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Solution


Q.

Read the following statements and choose correct statements:                                [2022]
(A) Euchromatin is loosely packed chromatin.
(B) Heterochromatin is transcriptionally active.
(C) Histone octamer is wrapped by negatively charged DNA in nucleosome.
(D) Histones are rich in lysine and arginine.
(E) A typical nucleosome contains 400 bp of DNA helix.

Choose the correct answer from the options below:
1 (B), (D), (E) only  
2 (A), (C), (D) only  
3 (B), (E) only  
4 (A), (C), (E) only  

Ans.

(2)

In a typical nucleus, some region of chromatin are loosely packed (and stains light) and are referred to as euchromatin. Euchromatin is transcriptionally active chromatin whereas heterochromatin is inactive. Histone octamer is wrapped by negatively charged DNA to form nucleosome. Histones are rich in basic amino acid residues lysine and arginine. A typical nucleosome contains 200 bp of DNA helix.