MHT CET · BIOLOGY · STD 12 - 4. Molecular Basis of Inheritance

Identify the INCORRECT statement regarding packaging of DNA in prokaryotes.

A 1100µ long nucleoid is packaged into a cell of 2-3µ long.
B Circular unfolded chromosome is 350µ in diameter.
C The DNA gets packaged into 30µ size due to coiling and supercoiling of each loop.
D Supercoiling results in reducing the size of DNA to 2µ diameter.

Verified Solution

Answer & Solution

Correct Answer

(C) The DNA gets packaged into 30µ size due to coiling and supercoiling of each loop.

Step-by-step Solution

Detailed explanation

The DNA is reduced to 30 µ in diameter because of folding/ looping (not coiling and supercoiling).

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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