Question

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

• A. Both Statement I and Statement II are incorrect
• B. Statement I is correct but Statement II is incorrect
• C. Statement I is incorrect but Statement II is correct
• D. Both Statement I and Statement II are correct

Hint:

The RNA world hypothesis proposes that RNA was both the genetic material and catalyst for early life. DNA is more stable and evolved later, allowing for greater preservation of genetic information.

Answer 1

The Correct Option is D

Statement I is accurate. The RNA world hypothesis posits that RNA served as the initial genetic material, capable of both information storage and catalytic activity. RNA's inherent reactivity renders it unstable and susceptible to degradation. Statement II is also accurate. DNA developed from RNA and exhibits greater stability due to its double-stranded structure, which facilitates complementary base pairing and mutation protection. DNA's structure, combined with repair mechanisms, confers superior stability compared to RNA. Consequently, both Statement I and Statement II are deemed correct.