Answer:
External factors can be cell to cell contact. Internal factors can be when the DNA is disrupted or a cell already has two of a part then will be divided.
Explanation:
Cell to cell can make a cell think it has already been divided while if DNA is disrupted it could cause nonstop growth, known as cancer.
Cells in contact with one another can be considered an external force. Internal factors can play a role in cell division, such as when the DNA of a cell is damaged or when it already contains two copies of a particular component.
What are factors regulating cell cycle?Signals that come from the outside can be either physical or chemical. Contact between individual cells is an illustration of a physical component. Once they come into contact with other cells, the vast majority of mammalian cells will cease their dividing. One example of a chemical signal would be growth factors, which are proteins that encourage cell proliferation and are also an example of chemical signals.
Internal factors such as kinases and cyclins are responsible for regulating cell division. Cyclin-dependent protein kinases are responsible for determining, once cells reach a checkpoint in the middle of the cell cycle, whether or not they will continue the process of cell division or call an end to it.
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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.
What proportion of purple kernels is expected in the progeny of the monohybrid cross?
......................................................
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.
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.
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.
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:
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.
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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Explain how fossils were used to develop early geologic time scales.
Answer:
Fossils refer to the remains of the past life like shells, bones, or other tough parts, and it may also comprise the proof of past life-like leaf impressions or footprints. A geologic time scale refers to the timeline, which demonstrates the past time of the Earth.
The planet in which we live is very old, and the study of the past of the Earth needs one to think about the times, which were millions or billions of years old. The geologic time scale is used by scientists to explain how the incidents took place on Earth.
The development of the geologic time scale was done after scientists witnessed certain modifications in the fossils that took place from the oldest to the newest sedimentary rocks. The phenomenon of relative dating was used to differentiate the past of the Earth in many parts of time when the same organism was there on Earth.
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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largest bird in the world, don't search on google baba
Answer:
ostrich is the right answer.
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
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!
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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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.
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.
How would the coils in the middle of the diagram change
to show a longitudinal wave with higher energy?
They would be farther apart.
They would be closer together.
O They would be shaped like a hill.
O They would be shaped like a valley.
Answer:
They would be shaped like a hill.
Explanation:
A longitudinal wave with higher energy have greater amplitude. Amplitude is the distance between the crust and trough of the wave. Crust is the upper part of the wave while trough is the lower part of the wave. If the distance between crust and trough of the wave is higher so the amplitude is also greater and we can say that the wave contains high amount of energy and vice versa. The shape of the wave just like a hill.
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.
Drag each label to the correct location on the image. Smooth hair is dominant in horses, and curly hair is recessive. Black hair is dominant, and chestnut hair is recessive. If S denotes smooth and s denotes curly, B denotes black and b denotes chestnut, classify the alleles according to their types. SS BB bb Ss Bb ss
Answer:
Smooth hair is dominant in horses, and curly hair is recessive: Ss
Black hair is dominant, and chestnut hair is recessive: Bb
Explanation:
Dominant traits are the strong traits pass in the next generation and an individual show dominant traits while recessive traits are the weak alleles that are less likely to pass in the next generation.
It is given:
Smooth hair = S
Curly hair = s
Black = B
Chestnut = b
So according to this, horses with Smooth hair as dominant trait and horses with curly hair as a recessive trait will be referred as Ss and Black hair is dominant, and chestnut hair is recessive will be referred as Bb.
Answer:
Smooth hair is dominant in horses, and curly hair is recessive. Black hair is dominant, and chestnut hair is recessive. If S denotes smooth and s denotes curly, B denotes black and b denotes chestnut, classify the alleles according to their types.
Explanation:
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
Sound can be heard when air passes over a respiratory structure that is located between the pharynx and the trachea.
Which structure is responsible for the voice?
The structure which is responsible for the voice is called the Larynx or voice box.
What do you mean by Trachea?The Trachea may be defined as the airway that leads from the larynx (voice box) to the bronchi.
The larynx is a hollow structure that is connected to the trachea through which the pass of air takes place to the lungs. The larynx is the structure that also produces vocal sounds as well.
Therefore, the structure which is responsible for the voice is called the Larynx or voice box.
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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.
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.
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
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.
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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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.
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?
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
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.