SSC
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following is/are true of nucleosomes?I. They contain six histone proteinsII. They control gene expressionIII. They help in DNA supercoiling
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I only
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II only
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II and III only
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I, II and III
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Explanation:
Detailed explanation-1: -Answer and Explanation: a. DNA is wrapped around proteins known as histones to form structures called nucleosomes. This statement is true.
Detailed explanation-2: -Each nucleosome is composed of a little less than two turns of DNA wrapped around a set of eight proteins called histones, which are known as a histone octamer. Each histone octamer is composed of two copies each of the histone proteins H2A, H2B, H3, and H4.
Detailed explanation-3: -The nucleosome core particle consists of DNA wrapped around a histone octamer consisting of teo copies each of the four histones H2A, H2B, H3 and H4. A typical nucleosome contains 200 bp of DNA helix.
There is 1 question to complete.