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Cell The Unit of Life — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYCell The Unit of Life3 Marks
Question
What are histones? What are their functions?
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Answer

Histones are lysine and arginine rich basic proteins involved in DNA packing in eukaryotes. There are five types of histone proteins $-H, H_2 A, H_2 B, H_3$ and $H_4$. Four of them $\left(H_2 A, H_2 B, H_3\right.$ and $\left.H_4\right)$ occur in pairs to produce histone octamer, called nu body or core of nucleosome. Being positively charged (due to basic amino acids) they attract negatively charged strands of DNA.

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