Answer:
Tube no. 6 in which 0.2 ml plated with no dilution
Explanation:
Tube no. 6 in which 0.2 ml plated with no dilution is used has higher the activity of ligase enzymes as compared to other tubes. The ligase enzyme worked as to speedup the binding of two molecules and making one large molecules. In Tube no. 6, 320 colonies were formed which is the highest number of colonies as compared to others so we can say that on Tube no. 6 ligase activity is higher as compared to others.
What is radioactive dating?
A. A method of determining the age of a fosall based on the amount
of certain isotopes that remain in a fossil or rock
B. A method of determining the age of a fossil that estimates the age
of the organism at its death
C. A method of determining the age of a fossil based on a
comparison to the age of other similar fossil
D. A method of determining the age of a fossil that estimates how
closely related various fossilized organisms were
Answer:
A
Explanation:
Radioactive dating uses carbon isotopes to determine the age of a material.
Radioactive dating is a method of determining the age of a fossil, based on the amount of certain isotopes that remain in a fossil or rock. Thus, the correct option is A.
What is Radioactive dating?Radioactive dating may be defined as a methodology for estimating the approximate age of rocks and minerals by the utilization of radioactive isotopes.
This method of radioactive dating is primarily used in igneous and metamorphic rocks, which cannot be dated by the method of stratigraphic correlation that is used for determining the age of sedimentary rocks.
Therefore, the correct option for this question is A.
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largest bird in the world, don't search on google baba
Answer:
ostrich is the right answer.
A scientist is examining the-function of macromolecules in a cell. She notices that movement of large molecules into and out of cells is disrupted when she damages one specific type of macromolecule. Which macromolecule has she most likely damaged.
Answer:
Proteins are the macromolecules damaged by the scientists while performing experiment.
Explanation:
Lipids and proteins are two components that makes the cell membrane and help them to play their role. Proteins found in between the bilayer of lipids and assists the bilayer transferring of various substances in and out of the cell also known as carrier molecules.
Hence, when scientist was examining the macromolecules, the proteins were get damaged and thus the movement of materials also get interrupted.
Thus, to the given question protein is the answer.
Answer:
The answer is D
Explanation:
Got it right on Edge
A student notices that there are situations in which her avocados go bad very quickly. She decides to test the effect of temperature on how fast the avocado ripens. She purchases 3 mini avocados and 3 regular sized avocados. She places 2 mini avocados in the refrigerator and 2 regular sized avocados on the windowsill. She then placed the last mini avocado and regular sized avocado in a paper bag under the sink. Is this a controlled experiment? Why or why not?
Answer:
The last mini avocado and regular sized avocado in a paper bag under the sink is this a controlled experiment.
Explanation:
The last mini avocado and regular sized avocado in a paper bag under the sink is this a controlled experiment because it contains both the mini avocado and regular sized avocado in a paper bag under the sink, which is believed to have high temperature.
So to indeed know whether temperature has effect on the avocado, the control experiment is the mini and regular sized avocado in the paper bag under the sink.
Hope it helps.
how are mitosis and meiosis similar A. they both produce reproductive cells B. they both produce new cells C. they both make new cell walls D. they both reduce the chromosome number
Answer:
They both produce new cells
Explanation:
Mitosis and meiosis both represent cell division that occur in humans and other animals. These cell division processes share many aspects, including the production of new cells and replication of genetic material.
Mitosis divides a parent cell into two identical daughter cells, each of which has the same amount of chromosomes. Meiosis, on the other hand, creates four distinct daughter cells, each of which has half as many chromosomes as the parent cell. The correct answer is B).
What is cell division?The next generation is created via cell reproduction in single-celled organisms. Cell division happens in multicellular creatures for a variety of reasons, including expansion and the replacement of damaged cells already present in the organisms.
Cell division always involves a complex set of stages that are highly controlled. While mitosis and meiosis relate to two distinct processes of nuclear division, cytokinesis describes the division of a cell's cytoplasm.
The original nucleus divides into two identical nuclei during mitosis. Contrarily, meiosis produces four nuclei, each of which has half as many chromosomes as the parent cell. Only the gametes, the egg and the sperm, go through meiosis in mammals.
Cell division occurs during meiosis as well as mitosis. The M-phase of the cell cycle is when both processes take place. The prophase, metaphase, anaphase, and telophase stages are common for both cycles. DNA synthesis occurs during both cycles.
Both produce new cells, while meiosis is a specific type of cell division that occurs in germ cells during the production of gametes and results in the formation of haploid gametes, mitosis is responsible for the development of organisms.
Therefore, the correct answer is B).
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Which scenario describes allopatric speciation?
A) A population of squirrels is separated by the Grand Canyon. The two
subpopulations evolve into two distinct species.
B) A tetraploid plant species evolves from a diploid ancestor. Both the tetraploid
and diploid species are found in the same habitat.
C) One population breeds in the fall; another population breeds in the spring.
D) A male horse and a female donkey mate, producing a sterile hinny.
Answer:
A) A population of squirrels is separated by the Grand Canyon. The two subpopulations evolve into two distinct species.
Explanation:
Answer:
Ok
Explanation:
A) because it's true
A compound such as cephalothin that is made by a species of mold and is able to kill or inhibit a number of different bacteria is correctly referred to as:
Answer:
Antimicrobial agent
Explanation:
Antimicrobial agents are agents that helps fight against microorganism. The couple occur in natural or synthetic form.
Antibiotics are synthesis from natural source such as mold, bacteria to fight against various diseases.
Cephalothin produce by mold is an example of a natural antimicrobial that is produce by mold to kill microorganism causing various illnesses it could be further process into a synthetic antimicrobial agent and can be used as antibiotics.
As the bone collar thickens, the ____________ forms, and secondary ossification centers appear in the ____________ .
Answer:
Medullary cavity, epiphyses
Explanation:
During the thickening of the bone collar, the penetration of Osteoblasts into the decomposing cartilage occurs thereby replacing it with spongy bone giving rise to a primary ossification center.
Osteoclasts then brings abiut the nreak down of the spongy bone to open up the medullary cavity. The cartilage found in the epiphyses then continue to grow increasing the bone's length.
Explain why microorganisms such as bacteria are critical components of the nitrogen cycle. They deliver useable forms of nitrogen directly to animals. They destroy other microorganisms that would otherwise use up the nitrogen in the soil. They convert non-usable forms of nitrogen to usable forms. They filter nitrogen from the water that is used to nourish plants.
Answer:
They convert non-usable forms of nitrogen to usable forms.
Explanation:
Organisms such as plants cannot use the atmospheric nitrogen form N2 which is abundant. So bacterias are key players because there are special nitrogen fixing bacteria that convert N2 to usable forms of nitrogen such as ammonia (NH3).
Answer:
They convert non-usable forms of nitrogen to usable forms.
Explanation:
Quentlon 3 of 10
What is the responsibility of a scientist?
O A. To earn money
B. To study the physical world
C. To run governmenta
O D. To influence votero
Answer:
b
Explanation:
because what a sciatica do
What Happened to My Garden?
Bill’s grandparents have had a garden for as long as he could remember. As they got older, he helped them with the heavy lifting, moving dirt, digging potatoes, etc. But they still did most of the work, and reaped the fruits and vegetables of their labors most years.
But this year was different. His grandparents’ peppers, kale, potatoes, and other vegetables were not only not thriving, they were dying – all of them. It had been an exceptionally wet year; usually they had to water everyday, but there had been enough rain to limit watering. In addition, Bill had set them up with a catchment system to catch and collect rainwater off the roof of their house. They had been using this to water the plants this year. His grandparents thought this water might be affecting their crops, or maybe it was the hailstorm they had early in the season. They had always saved seeds to replant every year, so that shouldn’t be a problem, should it? They also had new neighbors who had planted a garden right across the fence. They were a young family, just moved in, and they started their garden a bit late, but his grandparents were giving them advice.
What do you think could be causing Bill’s grandparents’ garden to die off? Describe a few possibilities.
1. They might be using the wrong kind of soil for the plants, causing them to die.
2. The new neighbors could be adding something toxic to Bill's grandparents' plants.
3. Maybe what the neighbors are adding to their garden is affecting Bill's grandparents' garden on the other side of the fence.
The things that are causing Bill’s grandparents’ garden to die off include microbe and new plant species by the neighbor.
There may be microbes in the rainwater that was collected. In this case, the microbes could have infected the plants and thus will have affected the growth of the plants.
Also, the new neighbors may have brought in new plant species and this may have had adverse effects on the plant. In such a case, it may have led to the death of the plants.
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PLEASE ANSWER I NEED HELP In a family, the father is affected by a genetic disorder. The son in the family has the same disease, but the daughters do not have it. What type of inheritance is this? A. Y-linked B. X-linked C. polygenic D. codominant
A. Y-linked.
Explanation:
Males have one Y chromosome and one X chromosome, while females have two X chromosomes.
If the father is affected by a genetic disorder, that means it will be passed down to only sons in the family, not females, since females do not have a Y chromosome.
This would mean the genetic disorder is Y-linked, and only on the Y chromosome, which is specific to males.
Answer:
A. Y-linked
Explanation:
Males have one Y chromosome and one X chromosome.
Females have two X chromosomes.
Father is affected by a genetic disorder. The son has the same disease. The daughters are not affected because they do not have Y chromosomes.
The father and son have Y chromosomes, so the type of inheritance is Y-linked.
When a primary oocyte undergoes meiosis, it forms four cells. How many cells develop into functional gametes
Answer:
One cell(Haploid)
Explanation:
Gametes cells consist of one cell, it is half the chromosome number of the body cell. Gametes are produce through reduction cell division called meiosis and it results in the production of four daughter cells that are haploid with each of the cells contain a haploid number of chromosomes.
During fertilization, the female cell contains haploid number of cells and the male contains haploid number of cell fuses together to form a diploid organism.
Retroviruses have extraordinarily high rates of evolution of all viruses because (SELECT ALL THAT APPLY):
Answer: Here are the options.
. They are single-stranded.
2. Their reverse transciptase has no proofreading capability
3. Their genetic material is RNA.
4. They disrupt the immune response.
The correct answer is because Their reverse transcriptase has no proof reading capability.
Explanation:
Retrovirus is a type of RNA that replicate it's copy and put it in the host cell DNA, there by changing it's genome. Retrovirus mutate at high rate in vivo viral replication. And this mutation in retroviruses may occur at different stages like during proviral transcription by RNA polymerase II, during minus-strand DNA synthesis (RNA template) by viral reverse transcriptase, or during plus-strand DNA synthesis (DNA template) by reverse transcriptase.
Retrovirus exhibit a high mutation rate. Polymerization errors during DNA synthesis by reverse transcriptase, has no proof reading capability, is a major method for generating genetic variation within retroviral populations.
Siblings Billy and Sue are brother and sister, but g are not genetic copies of each other. For example, Sue inherited their mother's copy of chromosome 13 but their father's copy of chromosome 14, while her brother Billy inherited their father's copy of both chromosomes 13 and 14. This is an example of:
Answer:
The options are
A.Independent assortment
B. Mutation
C. Crossing over
D. Non disjunction
The answer is A.Independent assortment
Explanation:
Independent assortment of genes involves the separation of genes during the formation and development of reproductive cells.
A boy has XY chromosome and a lady has XX chromosomes. This explains why Sue inherited the mother's copy of chromosome 13 but their father's copy of chromosome 14 while her brother Billy inherited their father's copy of both chromosomes 13 and 14. He inherited both due to the presence of XY chromosomes.
Rarely, the conjugation of Hfr and F− cells produces two Hfr cells. Explain how this event takes place.
Answer:
"F" on account of E.coli show the fertility factor. Cells possessing this factor (called donors) hold the ability to move the hereditary material over the strains by a procedure called conjugation. F-factor exists as a free element (cell is called episome) or integrated into bacterial chromosome (cell is called Hfr-High frequency recombinant). Cells with no F factor are recipients.
In a Conjugation between a F+ and F-cell just F factor from F+ cell gets moved o produce two F+ cells. But during a Hfr and F-conjugation as the F factor is incorporated into the chromosome and by the intrinsic idea of F factor to get moved the Hfr cells attempt to move their whole genetic material across and there are two outcomes wherein one case there is a fragmented exchange of hereditary material and the recipient cell remain F-and when there is a finished exchange of hereditary material the cell becomes Hfr yet this is uncommon as the time taken for the total exchange of hereditary material is excessively long for the cells to remain contact.
The chemicals released in a synapse when a signal passes through are _________.
A. Synaptic vesicles B. Receptors C. Receptors and Synaptic vesicles D. Neurotransmitters
The chemicals released in a synapse when a signal passes through are Neurotransmitter.
What is Neurotransmitter?Neurotransmitter is a chemical that is released from a neuron after the happening of an action potential. The neurotransmitter travels across the synapse to excite or inhibit the target neuron.
So we can conclude that the chemicals released in a synapse when a signal passes through are Neurotransmitter.
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The chemicals released in a synapse when a signal passes through are called neurotransmitters.
What is a synapse?The term synapse is used to describe a gap that exists in the central nervous system. It is usual to transmit nerve impulses over such gaps. In that case, the neurotransmitter is required.
Hence, the chemicals released in a synapse when a signal passes through are called neurotransmitters.
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Which of the following statements correctly describes some aspect of ATP hydrolysis being used to drive the active transport of an ion into the cell against the ion's concentration gradient? (see book section: Concept 8.2: The free-energy change of a reaction tells us whether or not the reaction occurs spontaneously and see book section: Concept 8.3: ATP powers cellular work by coupling exergonic reactions to endergonic reactions)
A) The hydrolysis of ATP is endergonic, and the active transport is exergonic.
B) This is an example of energy coupling.
C) Both ATP hydrolysis and active transport are spontaneous because they result in an increase in entropy of the system.
D) Neither ATP hydrolysis nor active transport is spontaneous.
E) ATP is acting as a transport protein to facilitate the movement of the ion across the plasma membrane.
Answer:
B) This is an example of energy coupling
Explanation:
Energy coupling is a process by which cells carry out thermodynamically unfavorable, endergonic (energy-requiring) reactions to other exergonic (reactions that liberate free energy) reactions.
Reactions which are endergonic do not occur spontaneously as they result in a decrease in entropy and a positive free energy change, ∆G.
Exergonic reactions occur spontaneously as they result in an increase in entropy and have a negative free energy change, ∆G.
For example, the active transport of ions against their concentration gradients in cells is a non-spontaneous endergonic process which is coupled to the hydrolysis of ATP, an exergonic process in other for the reaction to proceed. ATP hydrolysis phosphorylates an amino acid side chain in the transport protein which then drives the forward process of transport of the ion.
Considering the above,
Option A: The hydrolysis of ATP is endergonic, and the active transport is exergonic is false because ATP hydrolysis is exergonic while active transport is endergonic.
Option B: This is an example of energy coupling is true.
Option C: Both ATP hydrolysis and active transport are spontaneous because they result in an increase in entropy of the system is false because only ATP hydrolysis is spontaneous
Option D: Neither ATP hydrolysis nor active transport is spontaneous is false because ATP hydrolysis is spontaneous.
Option E: ATP is acting as a transport protein to facilitate the movement of the ion across the plasma membrane is false because ATP is not a protein, rather it serves to activate the transport protein by phosphorylating it.
What proportion of purple kernels is expected in the progeny of the monohybrid cross?
......................................................
Which of the following are NOT ways that viral vectors are modified to be made safer?
a. deleting virulence genes
b. avoiding genome insertion next to oncogenes
Answer:
eliminating virulence genes would be the correct answer
Explanation:
The correct answer was that since if the relationship between viruses and oncogenes is modified, the release of the oncoprotein is avoided, as well as the presence of malignant neoplasms before viral infections such as: epstein barr virus and kaposi's sarcoma.
So my answer is that the virulence factors of a virus cannot be modified to make viral vectors safer, the viral vector would be human and this is safer if its protoncogenes do not become oncogenes due to viral infections.
John complains of severe pain in the region of his left cheek which seems to increase when he chews on his food. A tense swelling is seen just anterior to his left ear. Which of the following structures do you think is the most likely cause of the problem?
1) submandibular salivary gland2) lingual tonsil3) palatine tonsil4) parotid salivary gland5) sublingual salivary gland
Answer:
Parotid salivary gland.
Explanation:
John's parotid salivary gland is the major cause of the problem
Parotid salivary gland is the largest of the salivary gland. Parotid salivary gland is found in the mouth, the upper part of the cheek and part of the ear.
This gland help to chew and empty saliva into the mouth.
A viral infection like flu, mumps can cause swelling of the parotid salivary gland.
Other symptoms include ;
Tender , lump cheeks.
Swollen cheeks
Difficulty in opening the mouth and swallowing food.
Pain in the left ear
Fever , chills and general weakness and so on.
Treatment of this depend on the type of infection, drinking hot water with lemon juice can help can help stimulate saliva.
Answer:
parotid salivary gland-parotitis.
Explanation:
This is located in front of and just below each ear.When the duct which drains this gland it blocked,drainage of saliva is prevented, and therefore lack of drainage leads to pain.
its inflammation is due primarily to bacterial infection,among other factors which are HIV,diabetes,etc.
Antibiotic intake is the most effective way of treatment.
In addition,the treatment is based on saliva stimulation to unblock the drainage. Therefore lemon intake either as raw or with water is ideal way.
How does amoeba engulf the food particle. ?
Answer:
Amoeba engulfs food particles with the help of pseudopodia which are the projections of cell membranes. A food vacuole is then formed around the food particle. Amoeba then secrets digestive enzymes that break down the food particle and digest it.
Explanation:
Answer:
Explanation:
Amoeba obtains its food by the process of endocytosis. It has flexible cell membrane. It engulfs the food particle with the help of pseudopodia and then forms a vacuole around it. When the particle is completely trapped the amoeba secretes digestive enzymes that digests the food.
True or false isotopes of the same element have a different number of neutrons with the same number of protons
Answer:
True, isotopes of the same element have a different number of neutrons with the same number of protons.
Individuals who have chronic bronchitis most often have:________.
A. a productive cough.
B. normal lung sounds.
C. a barrel chest.
D. substantial weight loss.
the correct answer is A.
Individuals who have chronic bronchitis most often have a productive cough. The correct option is A.
What is bronchitis?Bronchitis is an inflammation of the lungs' primary airways (bronchi), which causes them to become irritated and inflamed. On either side of your windpipe, the main airways branch off (trachea).
They have a consistent cough and lead to smaller and smaller airways inside your lungs called bronchioles.
Thus, the correct option is A.
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Ventilation supply systems shall deliver the required rate to the breathing zone, which extends to __________ feet from the enclosing walls.
Answer:
The correct answer is "2".
Explanation:
The missing options of this question are:
a) 2
b) 3
c) 4
d) 6
The correct answer is option a) "2".
According to the Federal Emergency Management Agency (FEMA) of the United States of America, a breathing zone must be established in order to ensure a proper ventilation supply. The breathing zone is a region that must be kept among systems and the enclosing walls or the floor. In the case of enclosing walls, at least two feet (600 millimeters) must be kept. Regarding the floor, at least three feet must be kept above the floor.
Which of the following is an indicator that energy has been transferred? Select all that apply.
An object speeds up or slows down
Smelling smoke, hearing a crackle
An object gives off noise, light, or heat
A child grows.
NEED HELP ASAP
Answer:
an object gives off noise, light or heat im think?
What part of oral cavity forms a protective covering over the other components of the periodontium and protects against trauma?
A. Dentin
B. Gingiva
C. Cementum
D. Periodontal Ligament
Answer:
Your answer is option A
Explanation: The gingival tissue in the oral cavity is the most important tissue of the oro-facial region for dental professionals to know and understand. The gingiva forms a protective covering over the other components of the periodontium and is well adapted to protect against mechanical insults.
how were the designs Pasteur's and Redi's experiments different?
Answer:
Francesco Redis experiment was conducted in 1668. His experiment was centered around the idea that maggots will arise from rotting meat. He conducted an experiment through his hypothesis that the maggots actually came from eggs laid by flies on the meat. To prove this he placed a piece of meat on 3 separate jars. He left one of the jars completely open, another sealed, and another covered by gauze. His hypothesis was proved to be correct when the only piece of meat that had maggots was the one that was left open.
Louis Pasteurs experiment was conducted in 1858. His experiment was influenced by a similar failed experiment conducted by Lazzaro Spallanzani in 1768. He was trying to prove that the air was not what was making the broth cloudy but what was actually making it cloudy was tiny microorganisms getting inside. To prove this, he created a swan neck flask that allowed air to come inside but trapped the microorganisms in a pocket on the flask.
Differences:
Redi used meat in his experiment while Pasteur used broth.Redis experiment was to disprove Aristotles idea that some life forms arise from non living matter. while Pasteurs experiment was to disprove the idea that air gives life force.Redis experiment was conducted in jars while Pasteurs was conducted in a hand made swan neck flask.Explanation:
Attached are some of the notes from my biology notebook i used to answer this question.
hope this helps!
1. To calculate the frequency of the brown allele, count the number of and divide by the total number of alleles in this population. 2. In this beetle population, the number of brown alleles is . 3. In this beetle population, the total number of alleles is . 4. The frequency of the brown allele in this beetle population is . 5. The frequency of the green allele in this beetle population is .
The given question is incomplete as the detail of the population was not given, however, the correct diagram related with the question is attached with the answer:
Answer:
The correct answer is -
brown alleles
8
20
0.4
0.6
Explanation:
1. To calculate the frequency of the brown allele, count the number of BROWN ALLELES and divide by the total number of alleles in this population
2. In this beetle population, the number of brown alleles = 8 represented by genes with the black color segment.
3. In this beetle population, the total number of alleles for both colors = 20
4. The frequency of the brown allele in this beetle population = 0.4
5. The frequency of the green allele in this beetle population = 0.6
The anode heel effect is more pronounced :
A with rotating anodes.
when the collimator is not completely ope
C when the collimator is open wide
D a the anode
Answer:
At the Anode.
Explanation:
Anode heel effect is the lower field intensity that occur at the anode compare to the cathode which is as a result of lower x-ray emissions from the target material at angles perpendicular to the electron beam.
It occur at the anode because the effect is stem when x-rays photons is absorbed before they leave the anode where they are produced.