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Mama L [17]
4 years ago
12

A researcher is using a modified version of FRAP. She has devised a technique that allows her to label all the peripheral membra

ne proteins with a fluorescent tag, and has bleached a specific area of the cell membrane. After 24 hours, she notices that fluorescence has returned to the bleached area. What can she deduce from this experiment?A. Peripheral membrane proteins are akin to integral membrane proteins.B. Peripheral membrane proteins may not be permanently associated with the cell membrane.C. Peripheral membrane proteins—like transmembrane proteins—are located within the cell membrane.D. Peripheral membrane proteins can move freely within the cell membrane.E. Peripheral membrane proteins can both move freely within the cell membrane and are akin to integral membrane proteins
Biology
1 answer:
asambeis [7]4 years ago
3 0

Answer:

The correct answer is option B.

Explanation:

FRAP or Fluorescence Recovery After Photobleaching refers to a method of finding the kinetics of diffusion in living cells, generally with the assistance of fluorescence microscopy. The method comprises the labeling of a particular cell constituent with a fluorescent molecule, imaging that cell, photobleach a small section of the cell, then image the recovery of fluorescence with time.  

In the given question, as the fluorescence has recovered back to the bleached region. The scientist can come to the conclusion that the membrane of the cell and the peripheral membrane proteins do not always belong together.  

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Answer:

True.

Explanation:

Because genetic mutations effect not only humans but animals too. Its how things evolve, like humans. So yes.

6 0
3 years ago
In sheep, white vs yellow body fat is determined by a single pair of autosomal alleles. In a large, randomly mating flock, 23 pe
Drupady [299]

Answer:

Option A , The allele for yellow is dominant to white

Explanation:

It is given that 23 percent of the sheep have white fat and 77 percent have yellow fat.

Thus, it is clear that sheeps with yellow fat is a dominant characteristics.

Usually, the frequency of homozygous recessive allele in a given population is represented by  q^2

and here q^2 = 0.23

Frequency of allele for white fat = q = \sqrt{0.23} \\q= 0.479

While frequency of homozygous dominant allele and heterozygous dominant allele is represented by p^2+2pq\\

And here p^2+2pq = 0.77

Allele for yellow fat = 1-q\\= 1-0.479\\= 0.521

Hence, option A is correct.

8 0
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Yes.

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Therefore, in a situation whereby the urine is seen to contain some red tiny droplets, specifically means the presence of an infection to the kidney.

In this case, a cloudy urine might mean the presence of white blood cell which stipulates the presence of infection.

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The answer to this question is letter D

3 0
3 years ago
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There are two types of variables that can lower internal validity: extraneous variables, which are any factors that are in the experiment but not being studied, and confounding variables, which are related to the independent variable and affect the dependent variable.

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