(a) Estimate the total mass of an HIV virion by comparing its volume with that of an,E coli cell and assuming they have the same density.(b) The HIV maturation process involves proteolytic clipping of the Gag polyprotein so that the capsid protein CA can form the shell surrounding the RNA genome and nucleocapsid NC can complex with the RNA itself. Using Figures 2.30 and 2.31 to obtain the capsid dimensions. estimate the number of CA proteins that are used to make the capsid and compare your result with the total number of Gag proteins.
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It is difficult to estimate the total mass of an HIV virion by comparing it to an E. coli cell without more information. The density of the CA proteins two would have to be assumed to be the same, which may not be the case.
Regarding the HIV maturation process, it is known that the Gag polyprotein is proteolytically clipped to produce the capsid protein CA, which forms the shell surrounding the RNA genome and nucleocapsid NC. The number of CA proteins used to make the capsid can be estimated by using the dimensions of the capsid obtained from figures 2.30 and 2.31. However, HIV and more information it is difficult to compare the result with the total number of Gag proteins. It is important to note that the exact number of Gag and CA proteins per virion can vary depending on the stage of the virus.
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The complete Question is:
HIV estimates
(a) Estimate the total mass of an HIV virion by comparing its volume with that of an E. coli cell and assuming they have the same density.
(b) The HIV maturation process involves proteolytic clipping of the Gag polyprotein so that the capsid protein CA can form the shell surrounding the RNA genome and nucleocapsid NC can complex with the RNA itself. Using Figures 2.30 and 2.31 to obtain the capsid dimensions, estimate the number of CA proteins that are used to make the capsid and compare your result with the total number of Gag proteins
Refer below figures to answer the question.
Related Questions
in a certain species of fly, smooth wings (s) are dominant to wrinkled wings (s), and red (r) bodies are dominant to yellow bodies (r). a cross between a fly with the genotype ssrr and fly with the genotype ssrr results in the following offspring ratios:
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The recombination frequencies for be part order of gene is close to Be that is only 10 and then there is D.
Is 30%, and the distance between A. N.
CS is 25%. And the other.
In genetics, dominance is the phenomenon of one variant of a gene on a chromosome masking or overcoming the influence of another variant of the same gene on the other copy of the chromosome. The first variant is known as dominant, and the second as recessive.
A homozygous dominant genotype is an organism that has two dominant alleles for a characteristic.
Using the example of eye color, this genotype is written BB. A heterozygous genotype is defined as an organism with one dominant allele and one recessive allele. This genotype is written Bb in our example.
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The recombination frequencies for be part order of gene is close to Be, only 10, and then there is D. It is 30%, and the distance between A. N. CS is 25%. And the other dominant alleles
In genetics, dominant alleles is the phenomenon of one gene on a chromosome masking or overcoming the influence of another gene on the other copy of the chromosome. The first variant is known as dominant, and the second is recessive. A homozygous dominant genotype is an organism that has two dominant alleles for a characteristic.
Using the example of eye color, this genotype is written BB. A heterozygous genotype is an organism with one dominant allele and one recessive allele. This genotype is written Bb in our example.
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Photosynthesis is the process in which _____ from the sun is converted into chemical energy in a molecule of _____.
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light energy; molecule of glucose (chemical energy & glucose is a sugar)
how does a Temperature & Phase Change relate to a human and to the environment.
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The human body is able to regulate its internal temperature through a process known as thermoregulation.
What is thermoregulation?
This process involves the release of heat through mechanisms such as sweating and the constriction or dilation of blood vessels. A change in external temperatures, such as exposure to extreme heat or cold, can disrupt this process and lead to conditions such as hypothermia or hyperthermia.
Phase change includes the melting of ice or the boiling of water. it can also have an impact on the environment. For example, the melting of glaciers and ice caps due to rising temperatures can contribute to sea level rise, which can have a variety of negative effects on coastal communities and ecosystems. Similarly, the boiling of water can lead to the formation of steam, which can be harnessed as a source of energy but also can cause severe damage in case of eruption or explosion.
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hich of the following attributes is common to both prokaryotic cells and eukaryotic cells? view available hint(s)for part a which of the following attributes is common to both prokaryotic cells and eukaryotic cells? a membrane-enclosed nucleus membrane-enclosed organelles generally about the same size the use of an external membrane to regulate the passage of materials from and to surroundings the use of proteins as information storage molecules
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C) the use of an external membrane to regulate the passage of materials from and to surroundings is option that common to both prokaryotic cells and eukaryotic cells.
What differentiates prokaryotic cells from eukaryotic cells?Eukaryotes commonly have multiple cells, whereas prokaryotes are exclusively unicellular. Eukaryotic cells are also between 100 to 10,000 times bigger and more sophisticated than prokaryotic cells. Prokaryotic DNA is stored in the cytoplasm, whereas DNA in eukaryotes is preserved in the nucleus.
What type of cell is eukaryotic?Animal and plant cells are eukaryotic, which means that they possess nuclei. Animals, fungi, plants, and protists all seem to have eukaryotic cells. DNA is typically stored in the nucleus, an organelle that is wrapped by a membrane known as the nuclear envelope.
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Which of the following attributes is common to both prokaryotic cells and eukaryotic cells? view available hint(s)for part a which of the following attributes is common to both prokaryotic cells and eukaryotic cells?
A) a membrane-enclosed nucleus
B) membrane-enclosed organelles generally about the same size
C) the use of an external membrane to regulate the passage of materials from and to surroundings
D) the use of proteins as information storage molecules
Genetic drift in a population affectsA scientist is trying to determine the relationship between clams, snails, and squid. When she generates a molecular clock, she is surprised to see that clams and squid are more closely related than clams and snails. Which did the molecular clock data show?
Clams and squid have been evolving separately for a longer time than clams and snails.
Clams and squid have been evolving separately for a shorter time than clams and snails.
Clams and snails have more in common genetically than clams and squid.
Clams and snails are more similar in related structures than clams and squids. the gene pool in which of the following ways?
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For a shorter period of time than clams and snails, squid and clams have undergone independent evolution. According to the molecular clock hypothesis, the evolution of DNA and protein sequences happens at a rate that is essentially consistent over time and among different kinds of organisms.
What is Molecular Clock?For instance, the gene that codes for alpha-globin, a protein that is a part of haemoglobin, suffers base alterations at a pace of. 56 modifications per base pair every billion years1. The gene could serve as a molecular clock if this pace is consistent.
With the help of this knowledge, evolution biologists can infer how species develop and determine the exact moment on the evolution history at which two species diverged. A molecular clock counts time from random changes (mutations) in molecules, as opposed to a wristwatch, which uses regular changes (ticks) to tell the time.
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identify at least three ways in which oxygen improved the opportunity for higher life forms to develop on the earth
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The increased creation of oxygen threw off the balance of Earth's original atmosphere. Because oxygen was hazardous to many anaerobic species, many anaerobic forms of bacteria were eliminated, creating biological "niches."
According to new research published in BMC Evolutionary Biology, oxygen had an important role in the evolution of complex species. According to the findings, the complexity of living forms developed earlier than previously assumed, and in tandem with the availability of oxygen as an energy source.
To survive, most living things require oxygen. Oxygen aids organisms in their growth, reproduction, and the conversion of food into energy. Humans obtain the oxygen they require by breathing into their lungs through their nose and mouth.
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assuming independent assortment, an individual of genotype ssyyaa would produce gametes of genotypes (in their correct proportions) . see section 14.3
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Based on independent assortment, an individual of genotype SsYyAa would produce gametes of genotypes: 1/8 SYA, 1/8 SYa, 1/8 SyA, 1/8 Sya, 1/8 sYA, 1/8 sYa, 1/8 syA, and 1/8 sya.
The Principle of Independent Аssortment describes how different genes independently sepаrаte from one аnother when reproductive cells develop. Independent аssortment of genes аnd their corresponding trаits wаs first observed by Gregor Mendel in 1865 during his studies of genetics in peа plаnts.
Аccording to the lаw of independent аssortment, the аlleles of two more genes get sorted into gаmetes independent of eаch other. The аllele received for one gene does not influence the аllele received for аnother gene.
Thus, an individual of genotype, SsYyAa would produce 8 gametes of genotypes. There are 1/8 SYA, 1/8 SYa, 1/8 SyA, 1/8 Sya, 1/8 sYA, 1/8 sYa, 1/8 syA, and 1/8 sya, becаuse of independent аssortment, аll possible аllele combinаtions would occur in equаl proportions.
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Should extreme snowfall over the course of a session cast doubt on the theory of global climate change
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Question 6 of 18
Which detail is true of Mary Shelley's life?
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Answer:
I need more information to answer
which of the following statements accurately describes homeostasis? multiple choice the body has the ability to detect change, activate mechanisms that oppose it, and maintain relatively stable internal conditions. the loss of homeostatic control can cause illness but cannot cause death. internal conditions are absolutely constant and must not fluctuate within a range. the internal state of the body is best described as a static equilibrium, in which there is a certain set point that must be strictly maintained at all times. all of these choices are correct.
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The body has the ability to detect change, activate mechanisms that oppose it, and maintain relatively stable internal conditions.
Internal conditions, like body temperatures, fluctuate within a specific range but are not completely constant.
Homeostasis is the propensity to maintain a steady, regular internal environment. In addition to temperature, the body regulates homeostasis for a variety of other variables. For instance, it's important to maintain the pH and glucose levels in your blood as well as the different ion concentrations there. You risk becoming seriously ill if these numbers fluctuate too much or too little.
Not simply at the level of the entire body as it is for temperature, but also at multiple levels, homeostasis is maintained. For instance, each individual cell maintains ion concentrations that are distinct from those of the surrounding fluid, and the stomach maintains a pH that differs from that of the surrounding organs. The body's general function depends on sustaining homeostasis at every level.
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true/false. the peptidoglycan cell wall and the one or two membranes present also impart a three-dimensional shape to the bacterial cell. the overall shape and arrangement of bacteria are genetically determined, so that each genus of bacteria has a characteristic shape (round, rod, spiral, etc.) and arrangements of the growing cell population (individual cells, chains of cells, or clustered cells).
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Bin 1 - A single spherical bacteria image.
Bin 2 - A solitary rodishaped bacteria image.
Bin 3 depicts a cluster of spherical microorganisms.
Bin 4 depicts a thread of rodishaped microorganisms.
Bin 5: Illustration of a vibrio (commaishaped) bacterium.
Bin 6 - Illustration of a spirochete bacterium with a corkscrew form.
1. cocci 2. Bacilli. 3.Staphylococci. 4.streptobacilli 5. vibrio. 6.Spirochete
Peptidoglycan is a component of the bacterial cell membrane that protects the cell from bursting owing to turgor and keeps the cell shape. Peptidoglycan, which is made up of glycan chains joined by short peptides, creates a net-like macromolecule that wraps around the cytoplasmic membrane.
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The peptidoglycan cell wall and the one or two membranes present also present a three-dimensional shape to the bacterial cell. The overall shape and arrangement of bacteria are genetically determined so that each rubric of bacteria has a characteristic shape( round, rod, helical, etc.)
Peptidoglycan( murein) is an essential and specific element of the bacterial cell wall set up outside the cytoplasmic membrane of nearly all bacteria( Rogers et al., 1980; Park, 1996; Nanninga, 1998; Mengin- Lecreulx & Lemaitre, 2005). Peptidoglycan provides severity to the cell wall; the cell walls of Gram-positive bacteria may contain up to 40 layers of peptidoglycan, conferring significant mechanical strength.
Peptidoglycan is a rigid envelope girding the cytoplasmic membrane of the utmost bacterial species. It helps cover bacterial cells from environmental stress and helps save cell morphology throughout their life cycle. Peptidoglycan biosynthesis is also an important controller of bacterial cell division.
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label at least 8 of the 9 identified parts of this typical multipolar neuron. (1/2 point each, 4 points total)
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A multipolar neuron is a type of nerve cell found in the central nervous system. It typically has multiple dendrites and one axon, which allow it to receive and transmit signals to other neurons.
Multipolar neurons are found in the brain and spinal cord and are involved in a variety of functions such as multipolar neuron movement, sensation, and cognition. They are considered the most common type of neuron and can be further divided into subtypes based on their location and function. Some examples of multipolar neuron subtypes include pyramidal neurons, which are involved in motor control, and Purkinje cells, which are found in the cerebellum and involved neurons in coordination and balance.
The Below image shows the labelled identified parts of this typical multipolar neuron.
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compared to the cones of a human eye, rods are group of answer choices less sensitive to light intensity found mainly on the periphery of the retina concentrated in the center of the retina capable of detecting color less numerous than cones
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In comparison of the cones and rods of a human eye, rods are B: mainly found on the periphery of the retina.
The human retina has two kinds of photoreceptors to gather light namely cones and rods. Rods are specialized cells in the retina of the eye that are responsible for vision at low light levels, also called scotopic vision. They are more sensitive to light than the other type of cell in the retina, called cones, which are responsible for color vision and visual acuity at higher light levels, also called photopic vision.
So in comparison to both rods and cons in human eye, rods are mainly found on the periphery of the retina.
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Why do the Darwin's bark spide
offspring have different gene
combinations even though they
have the same parents?
Answers
Answer:
Variation in traits can be caused by variation in protein molecules within individuals' cells.
Explanation:
Protein molecules' structures affect their function, and the way they connect to other molecules
match the term with the description of what creationists believe about the term. group of answer choices fossil record [ choose ] embryology [ choose ] vestigial organs [ choose ] homologies [ choose ]
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Fossil records match the term with the description of what creationists believe about the term. It is based on the law of superposition which states that an undisturbed rock sequences the bottom layers that are older than the top layers.
The fossil record helps to the geologists archaeologists and paleontologists which placed important species and events in the appropriate geologic era. Fossils referred to the preserved remains of plants, animals and other organisms from the past.
In the process of evolution fossils records provide the evidence that the present animal have originated from previously existing ones through the process of continuous evolution. The fossil record mostly required some gaps because it has the conditions to create fossils that have been rare ever since life began on Earth.
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Poor vascular supply, desiccation, hemorrhage, and hyper-granulation are factors that can contribute to
O chronic proliferation
O chronic inflammation
O infection
O all of the above
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Poor vascular supply, hemorrhage, desiccation, and hyper-granulation are factors that can contribute to B: chronic inflammation.
Chronic inflammation refers to a prolonged and persistent state of inflammation in the body. Inflammation is a natural response of the immune system to injury, infection, or other harmful stimuli, and is characterized by redness, warmth, swelling, and pain. However, when the inflammatory response persists for prolonged periods of time, it can become chronic.
Some factors that can becomes a cause of chronic inflammation are poor vascular supply, hemorrhage, desiccation, and hyper-granulation.
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A dominant allele, A, causes yellow color in rats. The dominant allele of another independent gene, R, produces black coat color. When the two dominants occur together (A/_ R/_), they interact to produce gray. Rats of the genotype a/a r/r are cream-colored. If a gray male and a yellow female, when mated, produce offspring approximately 3/8 of which are yellow, 3/8 gray, 1/8 cream, and 1/8 black, what are the genotypes of the two parents?
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The genotypes of the two parents of a gray male and a yellow female, when mated, produce offspring approximately 3/8 of which are yellow, 3/8 gray, 1/8 cream, and 1/8 black are male = AaRr; female = Aarr.
Let the dominаnt аllele for blаck coаt color be "R" аnd its recessive аllele be "r". Likewise let the dominаnt аllele for yellow color in rаts be "А" аnd its recessive аllele be "а". It is given thаt double recessive genotype аre creаm-colored i.e ааrr would be creаm colored.
Gаmetes of mаle: АаRr - АR, аR, Аr, аr
Gаmetes of femаle: Ааrr - Аr, Аr, аr, аr
АR аR Аr аr
Аr ААRr АаRr ААrr Ааrr
Аr ААRr АаRr ААrr Ааrr
аr АаRr ааRr Ааrr ааrr
аr АаRr ааRr Ааrr ааrr
Yellow offspring – Ааrr (4), ААrr (2), totаl 6 out of 16, hence probаbility is 3/8
Grey offspring – ААRr (2), АаRr (4) totаl 6 out of 16, hence probаbility is 3/8
Creаm offspring – ааrr (2), totаl 2 out of 16, hence probаbility is 1/8
Blаck offspring – ааRr (2), totаl 2 out of 16, hence probаbility is 1/8
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If a dish of chicken salad got contaminated with 80 Salmonella cells at 9am and Salmonella has a generation time of 30 minutes. How many Salmonella cells will be in the chicken salad when someone has a midnight snack at midnight?
what is the equation and answer?
Answers
30 * 80 = 540
by midnight the chicken salad will develop 540 cells
when an alarm sounds in the laboratory, it is important to respond hastily and remain choose... . listen for any other instructions, turn off any choose... in use, and be prepared to leave immediately.
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when an alarm sounds in the laboratory, it is important to respond hastily and remain choose clamly, quietly equipment and listen for any other instructions, turn off any choose in use, and be prepared to leave immediately.
When the fire alarm sounds during a laboratory room we should you should pull the fire alarm in the hallway and call 911 from a phone. If the fire alarm sounds for any reason leave the room immediately and exit the building.
When we hear a fire alarm we should evacuate the building immediately during lab and follow the directions of the Fire Wardens for our building, close all doors and and do not touch or use any elevators.
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leber congenital amaurosis (lca) is a type of autosomal recessive hereditary blindness that causes individuals with this disease to lose their vision during childhood. the pedigree below shows the inheritance of lca throughout three generations of a family.
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Leber congenital amaurosis (lca) is a type of autosomal recessive hereditary blindness that causes individuals with this disease to lose their vision during childhood. the pedigree below shows the inheritance of lca throughout three generations of a family. True. LCA is an autosomal recessive genetic condition that is passed on to children by parents who have an abnormal copy of the gene.
Inheritance of traits is a decrease in traits that are passed on from parents or parents to their offspring. Some of the characteristics that are passed from parent to child are hair shape, eye color, blood type, and even congenital diseases.
LCA or Leber Congenital Amaurosis is a congenital eye disorder that is present from birth. Babies from birth will lose their eyesight due to an autosomal recessive genetic condition. Babies with LCA inherit two copies of the abnormal LCA gene from both parents. A grandmother who has the normal gene marries a grandfather who has half the abnormal LCA gene So that the child will have half the abnormal or carrier genes, if the child marries someone who has half the abnormal or carrier genes, then it is certain that the third generation will have 100 percent of the abnormal LCA gene so that he will experience blindness from infancy.
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which of the following systems are directly responsible for the removal of wastes from the human body? select all that apply.
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C) 1 and 4, which are Digestive system and Respiratory system primarily responsible for the removal of wastes from the human body.
Which organ cleanses waste through digestion?The large intestine's primary job as an excretory organ is to discharge solid wastes that are still available after food has been digested and water has been recovered from indigestible material in food waste. Wastes are also accumulated in the large intestine from all throughout the body.
What function does the respiratory system play in removing unnecessary gases?Through the bloodstream, oxygen is transported throughout your body from the lungs. The waste gas carbon dioxide is exchanged for oxygen at every cell in your body. This waste gas is then carried by your bloodstream back to your lungs, where it is exhaled after being evacuated from the bloodstream.
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which of the following systems are directly responsible for the removal of wastes from the human body? select all that apply.
Digestive systemMuscular systemNervous systemRespiratory systemA) 1 and 2
B) 1 and 3
C) 1 and 4
D) 1, 2, 3, and 4
Which phase occurs directly after S phase? O A. Cytokinesis O B. G1 O C. M phase D. G2
Answers
The phase that occurs directly after S phase is G2.
Answer: The phase that occurs directly after S phase is G2 phase.
damaged cells and worn out, old cells are by new cells. damaged tissues are by the production of new cells. multiple choice question. repaired; replaced replaced; repaired
Answers
Answer: Replaced and Repaired
Explanation: Damaged cells and worn out, old cells are REPLACED by new cells. Damaged tissues are REPAIRED by the production of new cells.
Changes in white blood cell count are a classic example of molecular damage caused by significant exposure to ionizing radiation. True or False
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The statement "Changes in white blood cell count are a classic example of molecular damage caused by significant exposure to ionizing radiation is false because a classic example of molecular damage caused by significant exposure to ionizing radiation is skin burns and acute radiation syndrome.
Ionizing rаdiаtion is used in а wide vаriety of fields such аs medicine, nucleаr power, reseаrch, аnd industriаl mаnufаcturing, but presents а heаlth hаzаrd if proper meаsures аgаinst excessive exposure аre not tаken. Rаdiаtion dose depends on the durаtion of exposure, the аmount of rаdiаtion generаted from the rаdiаtion source, the distаnce from the rаdiаtion source, аnd the аmount аnd type of shielding in plаce.
Exposure to ionizing rаdiаtion cаuses cell dаmаge to living tissue аnd orgаn dаmаge. In high аcute doses, it will result in rаdiаtion burns аnd rаdiаtion sickness, аnd lower level doses over а protrаcted time cаn cаuse cаncer.
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Consider the steps involved in an experiment that uses the scientific method. Arrange the six given steps in the order in which they occur. One of the steps will not be used.
-Analyze the data collected in the experiment.
-Construct a hypothesis that might explain the observations about the natural phenomenon.
-Choose the data that are most likely to support the hypothesis and ignore the rest of the data.
-After observing a natural phenomenon, develop a question based on the observations.
-Conduct the experiment and collect the resulting data.
-Design an experiment that tests the hypothesis.
-Share the results and conclusions of the experiment.
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Answer:-Analyze the data collected in the experiment. -Construct a hypothesis that might explain the observations about the natural phenomenon.
Explanation:
The steps of the scientific method in the order in which they occur are as follows:
After observing a natural phenomenon, develop a question based on the observationsConstruct a hypothesis that might explain the observations about the natural phenomenonDesign an experiment that tests the hypothesisConduct the experiment and collect the resulting dataAnalyze the data collected in the experimentShare the results and conclusions of the experimentWhat is the scientific method?Scientific method is the method of discovering knowledge about the natural world based in making falsifiable predictions (hypotheses), testing them empirically, and developing theories that match known data from repeatable physical experimentation.
The scientific method is the standard method of making scientific claims about a subject and it includes the following steps:
Making a question based on observationsConstructing hypothesisTesting hypothesis via experimentationAnalyze the dataShare and conclude findingsBased on the above, the correct order of the steps in scientific method is given in the main answer.
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proteins-large complex molecules-are major building blocks of all living organisms. discuss the chemical composition and levels of structures of protiens
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Proteins' chemical composition and structural levels. Proteins are chemical macromolecules made up of monomeric components known as amino acids. Proteins are organized structurally as follows: Primary, secondary, tertiary, and quaternary education are available.
(b) DNA and RNA functions in protein synthesis
Ribosomal RNA, a kind of RNA found in ribosomes and important for protein synthesis, is produced from DNA. As a result, the significance of DNA in protein synthesis is critical: there are no proteins without DNA.
(c) Protein involvement in membrane structure and chemical transport across the membrane
Proteins can work by transporting ions in different ways.
(a) Proteins' chemical composition and structural levels.
Proteins are molecular macromolecules made by manomeric units called amino acids, which have a carboxyl group and an amino group connected to the same carbon in their structure. Proteins must be digested into the amino acids that make them up before they can be assimilated by the body.
Peptide bonds hold the amino acids together. The amino group of one amino acid reacts with the carboxyl group of the other in those linkages.
Proteins are organized structurally as follows:
Primary: The amino acid sequence in the chain with peptide bonds.
Secondary: The spatial organization of a protein's amino acids. They are held together by hydrogen bonds. There are two types: the propeller a and the folded blade b.
Tertiary: A three-dimensional arrangement of the polypeptide chain that is held together by van der Waals forces.
Quaternary: The formation of a protein complex by the union of weak links of arias polypeptic chains.
(b) DNA and RNA functions in protein synthesis
The most significant function of RNA is protein synthesis, in which it copies the genetic order contained in DNA and uses it as a standard in the manufacturing of proteins, enzymes, and other chemicals required by the cell and the organism. It gets to the ribosomes, which work as a kind of molecular protein factory, for this, and it does so in the pattern that the DNA prints on it.
(c) The roles of proteins in membrane structure and transport of molecules across the membrane
The cells contain proteins that are embedded in the lipid bilayer of their plasma membranes. These proteins can work by transporting ions in different ways.
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Full Question ;
Proteins, large complex molecules, are major building blocks of all living organisms. Discuss the following in relation to proteins.
(a) The chemical composition and levels of structure of proteins.
(b) The roles of DNA and RNA in protein synthesis
(c) The roles of proteins in membrane structure and transport of molecules across the membrane
If one of the products is added to a system initially at equilibrium, then the reaction will proceed in the ______ direction in order to decrease
Answers
When a system is initially at equilibrium and one of the products is added, the reaction will move in the opposite direction to slow down.
What happens in an equilibrium system when a product is added?
When a product is added to an equilibrium system, its concentration rises, shifting the equilibrium to the right. The product concentration will continue to rise until the reaction reaches a new equilibrium as a result of the reaction moving in the direction that produces the product as a result.
Depending on the relative concentrations of reactants and products at the time of addition, the reaction may also shift in the opposite direction. The relative concentrations will determine the new equilibrium point.
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which of the following may occur at the site of the synapse to prevent constant stimulation or inhibition of the receiving neurons?
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which of the following may occur at the site of the synapse to prevent constant stimulation or inhibition of the receiving neurons? A. Synaptic Cleft B. Receptor Desensitization C. Reuptake D. All can apply
Option D, The synaptic cleft, the space between the presynaptic and postsynaptic neurons, contains enzymes that rapidly degrade neurotransmitters, reducing their concentration and thus limiting their effect.
At the synapse, there are several mechanisms to prevent constant stimulation or inhibition of the receiving neurons: Synaptic Cleft: The synaptic cleft, the space between the presynaptic and postsynaptic neurons, contains enzymes that rapidly degrade neurotransmitters, reducing their concentration and thus limiting their effect. Receptor Desensitization: The postsynaptic neuron may also have receptors with rapid desensitization, which reduces their responsiveness to continued stimulation. This occurs through changes in the receptor's shape or location, making it less likely to bind to neurotransmitters and produce a response. Reuptake: Another mechanism is reuptake, where the presynaptic neuron reabsorbs neurotransmitters back into its terminal, reducing the amount available in the synaptic cleft. Inhibitory Feedback: Inhibitory neurons can also provide negative feedback to the presynaptic neuron, reducing the release of neurotransmitters and the stimulation of the postsynaptic neuron. Spatial and Temporal Summation: The postsynaptic neuron integrates signals from multiple synapses over time and space. If the stimulation is not sustained, the postsynaptic neuron's response will decay.
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What was Dr. Kettlewell's conclusion on his experiment with bird predation on the moths?
Answers
Answer: Dr. Kettlewell concluded that the observed shift in moth coloration was the result of natural selection, with the darker moths being better adapted to survive in heavily polluted environments.
Explanation: Dr. Kettlewell's experiments on bird predation of the moths were conducted in the 1950s and 1960s and focused on the peppered moth, a species that occurs in both light and dark forms. The study found that birds were more likely to prey on the lighter, more visible moths when they rested on trees covered in soot and industrial pollution, while the darker moths were better able to camouflage and avoid predation. Dr. Kettlewell concluded that the observed shift in moth coloration was the result of natural selection, with the darker moths being better adapted to survive in heavily polluted environments.
Answer: wrong colored moths were eaten at twice the rate of the camouflaged moths.
Explanation: Kettlewell's overall position was that natural selection by bird predation on the white colored moths caused the change in moth ratios from 98% white to 98% dark. Kettlewell basedthis on his experiments and his conclusion that the wrong colored moths were eaten at twice the rate of the camouflaged moths
Which of the following steps has not yet been accomplished by scientists studying the origin of life?
a, abiotic synthesis of small RNA polymersb. abiotic synthesis of polypeptidesc. formulaton of molecular aggregates with selectively permeable membranesd. formulationof protobions that use DNA to direct polymerisation of amino,acids
Answers
Scientists researching the genesis of life have not yet succeeded in creating protobions that use DNA to drive the polymerization of amino acids. So, last option is correct.
Both genetic data and the catalyst for chemical processes in early cells are stored in RNA.
In contemporary cells, which can be seen as molecular remains of a previous world, RNA still catalyzes a number of essential reactions.
The genetic material in humans and almost all other animals is called DNA, also referred to as deoxyribonucleic acid.
The cell has two different forms of DNA: mitochondrial DNA and autosomal DNA.
DNA didn't become the dominant genetic component until much later in the evolutionary process, and proteins took over as the primary catalyst and structural element of cells.
The instructions required for daily life are found in DNA. Our DNA contains instructions on how to build the proteins necessary for our growth, development, and general health.
Formation of molecular collections with some characteristics of life, such as metabolism and energy storage, and the ability to sustain an internal environment distinct from their environment.
Learn about DNA here:-
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