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hammer [34]
3 years ago
11

PLEASE HELP

Biology
1 answer:
ss7ja [257]3 years ago
4 0

Answer:

A( stages

Explanation:

hhj

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Cellulose is a:_____________.
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A. Indigestible fiber

Explanation:

Humans cannot digest cellulose, but it is still important in the diet as a fiber.

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Which organ produces estrogen and progesterone?
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Wild forest pigs called peccaries feed on plant bulbs, other plant roots, insects, and small animals. What can you infer about p
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8 0
3 years ago
Which pair of molecules both contain carbon atoms?
andrew11 [14]
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3 years ago
The interaction between DNA and histone proteins (forming nucleosomes) plays a key role in the regulation of gene expression in
ladessa [460]

Answer:

A. The chromatin near cis-regulatory sequences will be more closed and there will be less transcription.

Explanation:

In the presence of histones, the cis-regulatory sequences of DNA like promoter, enhancers etc. are not exposed. The function of the histone acetyltransferases (HATS) is to cause chromosome decondensation i.e. removal of histones from the DNA so that transcription of the DNA could occur. Histone acetyltransferases (HATS) cause acetylation of lysine amino acid of the histone proteins. Acetyl group is negatively charged so the acetylation of histone proteins leads to the removal of their positive charge which ultimately leads to the decrease in the interaction between N terminal of histones and negatively charged phosphate group of the DNA molecule. As soon as histones are removed from the DNA where cis-regulatory sequences are located, the DNA becomes accessible for transcription.

But here a drug has been added which blocks the activity of histone acetyltransferases (HATS) in cancer cells. So it is quite evident that in these cells, histones will not get removed from the cis-regulatory sequences of DNA so the DNA will be more closer or tightly packed as a result of which  less transcription will occur.

7 0
3 years ago
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