CBSE 2025, Compartment, Set 1

Question

Assertion (A): DNA chemically is less reactive and structurally more stable when compared to RNA.
Reason (R): DNA has 2'- OH group present at every nucleotide, which makes it more stable than RNA.

Select the correct option: A). Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). B). Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). C). Assertion (A) is true, but Reason (R) is false. D). Assertion (A) is false, but Reason (R) is true.

Edvaya · Accepted Answer

The correct answer is Assertion (A) is true, but Reason (R) is false.. **SOLUTION** **Assertion (A) is True:** DNA is fundamentally preferred as genetic material over RNA because its chemical structure is far less reactive and much more stable. **Reason (R) is False:** DNA specifically *lacks* the reactive $2^{\prime}	ext{-OH}$ group on its ribose sugar (it has deoxyribose). It is precisely the presence of this exposed $2^{\prime}	ext{-OH}$ group in RNA that makes RNA highly reactive, catalytic, and easily degradable. Because the reason incorrectly assigns the $2^{\prime}	ext{-OH}$ to DNA, it is false.

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Biology > Reproduction And Genetics > Molecular Basis Of Inheritance

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