Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below :
- Statement I is correct but statement II is incorrect
- Statement I is incorrect but statement II is correct
- Both statement I and statement II are correct
- Both statement I and statement II are incorrect
Answer
(3) Both statement I and statement II are correct
Solution
Statement I: According to the RNA world hypothesis, RNA was the first genetic material. RNA acts as genetic material and also as a catalyst (ribozymes) for some important biochemical reactions; its 2'-OH group makes it reactive and hence unstable. Correct.
Statement II: DNA evolved from RNA with chemical modifications that make it more stable. Its double-helical complementary strands resist changes by evolving a process of repair. Correct.
Answer: (3)