Question

Which of the following is a structural element of chromatin?

• A. Histone
• B. Acid protein and DNA
• C. Nuclear matrix
• D. Nucleosome

Answer 1

Answer: (D)

Nucleosome

A. Histones are the low molecular weight, positively charged proteins that are rich in basic amino acids like lysine and arginine.

B. DNA packaging occurs in association with basic proteins and some acidic proteins.

C. Nuclear matrix is the network of fibres found inside the nucleus.

D. Nucleosome is the structure that consists of negatively charged DNA wrapped around the positively charged histone octamer (the core particle).

Hence, the structural element of chromatin (long threads of DNA and histone proteins) is nucleosome. So, the correct answer is 'Nucleosome'.