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BotanyNEET 2025DNA structure and replication

Molecular Basis of Inheritance

Given below are two statements:

Statement I: In the RNA world, RNA is considered the first genetic material, evolved to carry out essential life processes. RNA acts as a genetic material and also as a catalyst for some important biochemical reactions in living systems. Being reactive, RNA is unstable.

Statement II: DNA evolved from RNA and is a more stable genetic material. Its double-helical strands, being complementary, resist changes by evolving a repairing mechanism.

In the light of the above statements, choose the most appropriate answer from the options given below:

  1. A.Both Statement I and Statement II are correct✓
  2. B.Both Statement I and Statement II are incorrect
  3. C.Statement I is correct but Statement II is incorrect
  4. D.Statement I is incorrect but Statement II is correct

Solution

NCERT presents exactly this account of the RNA world: RNA was the first genetic material and a catalyst, but being reactive it was unstable, and the more stable double-stranded DNA with its repair mechanisms evolved from it. Both statements are correct.

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