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Biology Exemplar

Cell: The Unit of Life

What are histones? What are their functions?

Biology Exemplar

Biology Exemplar

Class 11

NCERT Exemplar

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What are histones? What are their functions?

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What are histones? What are their functions?

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Updated on: Oct 4, 2023

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Text solutionVerified

Histones are the basic group of globular proteins that have a high content of basic amino acis, i.e., arginine and lysine. Histones forms the part of the chromosomal material in eukaryotic cells.
There are five types of histone proteins

H_{1}, H_{2} A, H_{2} B, H_{3}

and

H_{4}

. Four of them

(H_{2} A, H_{2} B, H_{3}

and

H_{4}

) occur in pairs to produce histone octamer called core of nucleosome.
Functions Histones bear positively charged ends, that attract negatively charged strands of DNA.
Histones provides a medium around which DNA winds, and they play a vital role in gene regulation, as they act as gene repressor. They form the chromatin material and provide stability as are not coagulated by heat.
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What are plasmids? Describe their role in bacteria.

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Question Text	What are histones? What are their functions?
Updated On	Oct 4, 2023
Topic	Cell: The Unit of Life
Subject	Biology
Class	Class 11
Answer Type	Text solution:1 Video solution: 1
Upvotes	224
Avg. Video Duration	9 min