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goldfiish [28.3K]
3 years ago
10

When examining cells in the laboratory, you notice that a particular cell has half as much DNA as the surrounding cells. It appe

ars that this cell's cell cycle halted at checkpoint _____.
Biology
1 answer:
kow [346]3 years ago
4 0

Answer:

G1 checkpoint

Explanation:

The cell cycle consists of the series of activities that occurs from the replication of DNA to the actual division of the cell in an organism's cell. However, the cell has been internally programmed to ensure that all conditions are in place/favorable before allowing progression into the next stage of the cell cycle. This internally controlled mechanism ia called CHECKPOINTS. This checkpoint occurs at three main stages of the cell cycle;

after G1 phase, G2 phase and during M phase.

In the G1 checkpoint, the cell ensures that the cell is in the right shape to proceed into the Synthesis phase of the cell cycle where it will double it's DNA. The checkpoint checks majorly for damage or change to the DNA before replicating it. If any error is found, that cell is halted and prevented from proceeding to the S-phase of the cell cycle.

This is the case in the question, the cell has been halted and prevented from entering the S-phase. Hence, its DNA is still the same as it started. However, the DNA of the cells surrounding it has been doubled as they have undergone DNA replication during S-phase.

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Suppose that we study a gene that has been linked to coronary heart disease. We find in a pilot study that in subjects with the
yawa3891 [41]

Answer:

T/ T genotype

Explanation:

To know which genotype appears to be associated with a higher prevalence of heart disease, you must know which genotype appeared in the highest percentage in the population tested.

For this, we will do the following calculations.

  • C/C Genotype:

200 people = 100%

20 people = X

X = (20 * 100) / 200

X = 10%

This means that the C/C genotype appeared in 10% of the tested population.

Now we must to know the percentage of the T / T genotype, we must consider 200 of the 250 people tested.

  • T/T Genotype:

250 people = 100%

200 people = x

X = (200 * 100) / 250

X = 80%

----

200 people = 80%

30 people = X

X = (30 * 80) / 200

X = 12%

Thus, we can say that the T / T genotype appeared in a higher percentage within the tested population, being considered the genotype that seems to be associated with a higher prevalence of heart disease.

3 0
3 years ago
What do we call the position of an organism in a food chain or food web?
chubhunter [2.5K]

Answer:

Producers

Explanation:

A food web is all of the food chains in an ecosystem. Each organism in an ecosystem occupies a specific trophic level or position in the food chain or web. Producers, who make their own food using photosynthesis or chemosynthesis, make up the bottom of the trophic pyramid.

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3 years ago
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Clean Air Act (CAA), US Federal law, passed in 1970 and later amended, to prevent air pollution and thereby protect the ozone layer and and promote public health. The clean air act gave the federal environmental protection agency the power it needed to take effective action to fight environmental pollution. Hope this helps シ
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2 years ago
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Unlike rocks, all minerals ________ and ________.
Maurinko [17]

The correct answer is B!

Why is this?

A mineral is a naturally occurring, inorganic solid with a definite crystalline structure and chemical composition. All minerals contain one or more elements, which are pure substances that cannot be broken down into simpler substances by chemical means.

8 0
3 years ago
Why do males typically have a higher basal metabolic rate compared to females?
zhuklara [117]

Answer:

Explanation:

BMR or basal metabolic rate can be define as the rate of expenditure of available energy when the body is in rest to keep the vital functions active such as breathing and circulation.

Males typically have higher BMR than females because they tend to have higher proportion of lean body mass as compared to females. The females as compared to males exhibit more amount of fat cells. The metabolism of fat cells is slow.

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3 years ago
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