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Biology - Chapter 16

Question:

When DNA is compacted by histones into 10 nm and 30 nm fibers, the DNA is unable to interact with proteins required for gene expression. Therefore, to allow for these proteins to act, the chromatin must constantly alter its structure. Which processes contribute to this dynamic activity?

A) DNA supercoiling at or around H1

B) methylation and phosphorylation of histone tails

C) hydrolysis of DNA molecules where they are wrapped around the nucleosome core

D) accessibility of heterochromatin to phosphorylating enzymes

E) nucleotide excision and reconstruction

Answer:

B) methylation and phosphorylation of histone tails

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Last update by mayur on 04/07/2014
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Biology   Chapter 16
Biology - Chapter 16
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Question: When DNA is compacted by histones into 10 nm and 30 nm fibers, the DNA is unable to interact with proteins required for gene expression. Therefore, to allow for these proteins to act, the chromatin must constantly alter its structure. Which processes contribute to this dynamic activity? A) DNA supercoiling at or around H1 B) methylation and phosphorylation of histone tails C) hydrolysis of DNA molecules where they are wrapped around the nucleosome core D) accessibility of heterochromatin to phosphorylating enzymes E) nucleotide excision and reconstruction
Answer: B) methylation and phosphorylation of histone tails