NEET · Biology · STD 12 - 5. molecular basis of inheritance

Histones are enriched with -

A Lysine & Arginine
B Leucine & Lysine
C Phenylalanine & Leucine
D Phenylalanine & Arginine

Verified Solution

Answer & Solution

Correct Answer

(A) Lysine & Arginine

Step-by-step Solution

Detailed explanation

In eukaryotes, packaging of DNA is much more complex. There is a set of positively charged, basic proteins called histones.

Histones are organised to form a unit of light molecules called histone octamer.
They are rich in the basic amino acid residues lysine and arginine.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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