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

Let's evaluate both statements: Statement I is correct. The RNA world hypothesis suggests that RNA was the first genetic material that could both store genetic information and catalyze chemical reactions. RNA is indeed unstable because of its reactivity, which makes it more prone to degradation. Statement II is also correct. DNA evolved from RNA and is more stable because of its double-stranded structure, which allows for complementary base pairing and protection against mutations. DNA’s structure, along with repair mechanisms, provides greater stability than RNA. Thus, the correct answer is Both Statement I and Statement II are correct.