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3 years ago

After which checkpoint is the cell first committed to continue the cell cycle through M?

Biology

1 answer:

Viktor [21]3 years ago

8 0

The correct answer is: B) G1

Normal cells (unlike cancer cells), move through the cell cycle in a regulated way in order to make sure that cells don't divide under conditions that are unfavorable for them. Information about their own internal state (nutrients, signal molecules, DNA integrity) is signal to go or not to go through the cell division. Because of that there are few checkpoints in the cell cycle at which the cell examines the signals and makes a “decision”. The major checkpoints are:

• The G1- the first point at which it must choose, once it passes the G1 checkpoint the cell enters S phase

• The G2-the cell checks DNA integrity and checks if replication is done well.

• The spindle checkpoint-at the transition from metaphase to anaphase.

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ancestors of giraffes with shorter necks could not reach branches high up in trees for food. this led to selection for longer-ne

hichkok12 [17]

With shorter necks, giraffe ancestors could not reach food-containing branches on tall trees. This resulted in the directional selection of giraffes with longer necks.

<h3>Why is choosing a direction necessary? </h3>

It nearly appears obvious that the giraffe's long neck developed as a result of a lack of food in the lower branches of trees. The giraffe has a significant advantage because it is taller than any other mammal and can feed where few others can.

When compared to modern giraffes, the giraffe's ancient predecessors had a shorter neck. The plants that were lying at a higher level were inaccessible to them. Giraffe phenotypes have changed in various ways, and now have long necks to reach vegetation that is higher up. The extreme form is chosen above other features in directional selection. It was decided to choose the long-necked giraffe over the short-necked.

To know more about direction selection for longer necked giraffes visit:

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1 year ago

Content practice a acceleration lesson 3 answers

sdas [7]

Acceleration is defined as the rate of change in the speed of a moving body or vehicle typically.

Explanation:

In the branch of mechanics, the aspect of acceleration is considered to be a property of the vector. And acceleration always occurs in a specific positive direction.

The formula for determining acceleration is change in the rate of velocity over a specific time, and is therefore measured as the ratio of delta velocity by delta time unit.

$\text {acceleration}=\frac{\text {velocity}}{\text {time}}=\frac{\left(\frac{\text {distance}}{\text {time}}\right)}{\text {time}}=\frac{\text {distance}}{\text {time}^{2}}\left(\mathrm{m} / \mathrm{s}^{2}\right)$

The unit of acceleration is distance per time unit squared or m / second squared.

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3 years ago

When conducting an experiment on how stimuli are represented by the firing of neurons, you notice that neurons respond different

daser333 [38]

Answer:

Divergence

Explanation:

This happens because of the different genetic makeup or genotype of different individuals. The divergence mechanism occurs because of divergent evolution where in some cases random chances occurs and neurons became a source of stimulus for one but not other and vice versa.

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3 years ago

In the citric acid cycle, the enzyme succinate dehydrogenase catalyzes a reversible reaction using FAD/FADH2 as an oxidizing/red

Aliun [14]

The statement which best explains how the redox component of this reaction contributes to the reaction's ability to be reversible under cellular conditions is; Choice D: The change in the biochemical standard reduction potential is small.

Discussion:

A reversible process is one in which the system and environment can be restored to exactly the same initial states that they were in prior to when the process occurred, if we go backward along the path of the process.

However, the necessary condition for a reversible process is therefore the quasi-static requirement.

The quasi-static requirement in this case is that the change in the biochemical standard reduction potential is small.

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2 years ago

An example of allopathic veterinary medicine is surgery True or false

kati45 [8]

An example of allopathic veterinary medicine is surgery. The sentence is a fact.

>> Veterinarians come in two types:
--allopathic - practice conventional medicine, believed that animal diseases come from bacteria, viruses, toxins, and such. To stop this, they perform surgery or treat sick animals with prescribed drugs.
--- holistic- treat the whole animal, not just one organ or limb.,believed that animal can heal themselves; consider the animals' environment and history; uses conventional and alternative modalities

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2 years ago