Question

Histones are rich in ...........

• A. Lysine and Arginine
• B. Serine and Leucine
• C. Leucine and Methionine
• D. Phenylalanine and Lysine

Hint:

Histones are rich in basic amino acids, particularly lysine and arginine, which are key for DNA binding.

Answer 1

The Correct Option is A

Step 1: Understanding histones.
Histones are proteins that play a key role in DNA packaging and gene expression. They are rich in basic amino acids like lysine and arginine, which help them bind to the negatively charged DNA.
Step 2: Analyzing the options.
(1) Lysine and Arginine: This is the correct answer. These amino acids are abundant in histones, aiding in DNA binding.
(2) Serine and Leucine: This is incorrect. These amino acids are not significantly present in histones.
(3) Leucine and Methionine: This is incorrect. Histones do not primarily contain leucine and methionine.
(4) Phenylalanine and Lysine: Incorrect. While lysine is present, phenylalanine is not abundant in histones.
Step 3: Conclusion.
The correct answer is (1) Lysine and Arginine as these are the amino acids most abundant in histones.