Genetics and Evolution NEET 2025: RNA World MCQ Answer

What is the Genetics and Evolution NEET 2025 RNA World answer?

The Genetics and Evolution NEET 2025 RNA World MCQ has Option A as the correct answer: both statements are true. NEET 2025 was held on 4 May 2025. The question belongs to Genetics and Evolution, specifically RNA World and Genetic Material. It is a statement-based MCQ tagged hard, with an expected solving time of 60 seconds.

You must judge these two claims independently:

• Statement I, paraphrased: Early life is proposed to have used RNA for heredity and essential biochemical functions.
• Statement II, paraphrased: DNA later became a more stable hereditary material because complementary strands support accurate maintenance and repair.

The four answer combinations were:

What evolved first is not necessarily what later became the more suitable genetic material.

How should you test each statement separately?

Test Statement I through the RNA World hypothesis. Then assess Statement II through DNA stability, complementarity and repair. Do not use either statement to prejudge the other. The official reasoning for this Genetics and Evolution NEET 2025 question supports both statements, so the answer is Option A.

1. Identify Statement I as a direct application of the RNA World hypothesis.

This hypothesis proposes that essential early-life processes evolved around RNA.

2. Check what RNA could do.

RNA can store genetic information and catalyse certain biochemical reactions.

3. Decide Statement I.

RNA combined information storage with catalytic activity. Essential early-life processes could therefore have evolved around RNA. Statement I is correct.

4. Evaluate Statement II independently.

DNA’s later advantage does not contradict the earlier RNA World. Statement II explains why DNA became more suitable for dependable heredity.

5. Check DNA’s chemical stability.

DNA is chemically more stable than RNA, making it better suited to storing genetic information over long periods.

6. Check complementarity and repair.

The two DNA strands are complementary. If one strand is damaged or altered, the other can provide a reference or template that supports repair mechanisms.

7. Decide Statement II.

Greater chemical stability, complementary strands and repair support make DNA a more stable genetic material. Statement II is correct.

8. Match the truth combination.

Both statements are correct, which matches Option A.

Correct answer: Option A, both Statement I and Statement II are correct.

How can you solve this RNA World MCQ in 60 seconds?

Use a two-column mental check: RNA explains early versatility, while DNA explains later stability. RNA had the dual advantage of carrying information and performing catalytic functions. DNA became the preferred long-term genetic material because of greater chemical stability, complementary strands and repair. The statements describe different stages of molecular evolution, so they do not conflict.

Use these two mental columns:

• RNA column: Early genetic system, information storage and catalytic activity.
• DNA column: Later preference, greater chemical stability, complementary strands and repair.

Use the 60 seconds as follows:

• Read and separate the statements: 10 seconds.
• Test Statement I using RNA World: 20 seconds.
• Test Statement II using DNA stability: 20 seconds.
• Match the option: 10 seconds.

$10+20+20+10=60\text{seconds}$ Judge each statement before comparing RNA and DNA. The rapid chain is:

Why does the method behind Option D fail?

Option D results from assuming that the most stable genetic material today must also have been the first genetic material. Greater stability explains why DNA was later preferred. It does not disprove the earlier RNA World. Evolutionary priority and present-day suitability are different questions.

The faulty comparison runs as follows:

• Correct fact: DNA is more stable than RNA.
• Faulty inference: DNA must therefore have been the first genetic material.
• Why it fails: Stability explains why DNA became preferred later, not which molecular system functioned earlier.
• Correct distinction: RNA offered heredity and catalysis. DNA later offered more stable information storage and repair.

Statement I concerns what is proposed to have evolved first. Statement II concerns what later became more suitable for long-term heredity. Both can be correct at the same time.

Which related Genetics and Evolution questions should you practise?

Practise these three questions to test the same ideas used in the Genetics and Evolution NEET 2025 MCQ: RNA’s dual role, DNA repair through complementarity and the correct evolutionary order.

Which property allowed RNA to function as hereditary material and participate in biochemical reactions?

Answer: RNA could store genetic information and also show catalytic activity.

Explanation: These two roles support the idea that essential early biochemical processes could evolve around RNA.

Why do complementary DNA strands improve genetic stability?

Answer: One strand can provide the reference needed to repair the other strand.

Explanation: Complementarity supports accurate maintenance and repair, making DNA dependable for long-term hereditary storage.

What is the correct evolutionary order of RNA and DNA?

Answer:

Explanation: RNA is proposed as the earlier versatile system. DNA was preferred later because it is more stable and supports repair.

For the next RNA-DNA statement pair, use two cues: RNA means early versatility; DNA means later stability. Test each statement independently before checking the option combinations.

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