Zoology · Evolution
NEET (UG) 2025 — Question 89
Given below are two statements : one is labelled as Statement I and the other is labelled as Statement II:
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 repairing mechanism.
In the light of the above statements, choose the correct answer from the options given below :
- Option A:Correct
Both statement I and statement II are correct.
- Option B:
Both statement I and statement II are incorrect.
- Option C:
Statement I is correct but statement II is incorrect.
- Option D:
Statement I is incorrect but statement II is correct.
Answer: A
Step-by-step solution
RNA is considered the first genetic material because it can act as both genetic material and a catalyst (ribozyme), but it is reactive and unstable. DNA evolved from RNA and is more stable due to its double-stranded complementary structure, which allows repair mechanisms to correct errors. Both statements are correct, so the answer is A.
Answer key and solution verified before publishing.
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- Exam
- NEET (UG) 2025
- Paper
- 2025 paper
- Subject
- Zoology
- Chapter
- Evolution
- Topic
- Biological Evolution