What will be the number of histone molecules in a chromatin fibre having 50 nucleosomes?

400

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450

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500

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1000

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Solution

The correct option is B 450
The nucleosome is DNA coiled around a core of histones. Histones are of 2 types linker histones and core histones. The core histone has 8 subunits. These are a pair of H2A, H2B, H3 and H4. One linker histone also forms the nucleosome. Hence, the total number of histone will be 9 X 50 = 450.
Thus the correct answer is option B.

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Identify the given image. [1]

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(b) Nucleosome

(d) Chromatin

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