Which one of the following statements regarding histone proteins is

by

Which one of the following statements regarding histone proteins is correct?

Histones are proteins that are present in mitochondrial membrane.
Histones are proteins that are present in nucleus in association with DNA.
Histones are proteins associated with lipids in the cytosol.
Histones are proteins associated with carbohydrates in the cytosol.
This question was previously asked in
UPSC CDS-1 – 2019
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The correct answer is B. Histones are a family of small, positively charged proteins found in the nucleus of eukaryotic cells. They play a crucial role in packaging DNA into structural units called nucleosomes, which are the basic building blocks of chromatin. DNA (which is negatively charged) wraps around histone octamers (eight histone proteins) to form these structures.
Histone proteins are primarily located in the nucleus where they bind to DNA to help package it into chromatin.
There are five main families of histones: H1, H2A, H2B, H3, and H4. H2A, H2B, H3, and H4 form the core particle of the nucleosome, while H1 acts as a linker histone, helping to further compact the chromatin structure. Histone modifications play a significant role in regulating gene expression.

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