BIO NMDCAT Chromosomes

nmdcat.online July 4, 2026

9. The highly basic amino acids found in exceptional abundance within structural histone proteins are

A. Glycine and Alanine

B. Lysine and Arginine

✓

C. Aspartate and Glutamate

D. Methionine and Cysteine

📝 Explanation

Histones are highly basic proteins because they contain large proportions of positively charged amino acids, specifically lysine and arginine. This positive charge mediates tight electrostatic interactions with the negatively charged sugar-phosphate backbone of DNA.

📖 Additional Information

Glycine and Alanine
Lysine and Arginine
Aspartate and Glutamate
Methionine and Cysteine

Histones are highly basic proteins because they contain large proportions of positively charged amino acids, specifically lysine and arginine. This positive charge mediates tight electrostatic interactions with the negatively charged sugar-phosphate backbone of DNA.

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