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belka [17]
3 years ago
5

Which statements about the modification of chromatin structure in eukaryotes are true?

Biology
1 answer:
stealth61 [152]3 years ago
5 0

Answer:

All of the statements are correct  except 6. (Deacetylation of histone tails in chromatin loosens the association between nucleosomes and DNA)

Explanation:

Chromatin structure and its modifications can change the package of the DNA and consequently, alter the gene expression. The most common modifications of the chromatin are covalent modifications such as acetylation/deacetylation (by acetyltransferases and eacetylases), methylation (by methyltransferases), and phosphorylation (by kinases).  This is the way of gene expression regulation.

The effects of modifications are different, for example methylation promotes  condensation of the chromatin and as a consequence, prevents binding of transcription factors to the DNA (transcription is repressed).

Acetylation loosens the association between nucleosomes and DNA (because it neutralizes the positive charge of histones) and consequently promotes transcription. Deacetylation is a process opposite to acetylation.

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Aliun [14]

Answer:

A. C4H8C4  - NOT

B. C12H12C4  - NOT

C. CóH1206  - yes

D. C4H2020 - NOT

Explanation:

Carbohydrates are one of macro molecules made up of carbon, hydrogen and oxygen. These are essential molecule as they provide nutrition and makes structural component in plants too.

The ration of carbon, hydrogen and oxygen is similar in almost every sugar or carbohydrate which is 1:2:1, one carbon molecule and one oxygen molecule per two molecule of hydrogen.

In choice A, and B have no oxygen molecule so they can not be carbohydrate, where as D have inappropriate ration in comparison to the carbohydrates.

Thus, the correct answer is :

A. C4H8C4  - NOT

B. C12H12C4  - NOT

C. CóH1206  - yes

D. C4H2020 - NOT

4 0
4 years ago
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irina1246 [14]

Answer:

D.both A and B

Explanation:

because if there some option,like abcd and the letter d. is both a and b that is the correct answer.

8 0
3 years ago
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alexandr402 [8]

Answer:

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Explanation:

Just took the test :)

Also, the answer choice is worded differently for me. The alternative answer is "A kidney malfunction that removes more water than normal".

6 0
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