Question

Which of the following statements are incorrect?
i. RNA acts as a genetic material as well as a catalyst
ii. RNA is more stable than DNA
iii. RNA has evolved from DNA
iv. The process of translation has evolved around RNA

• A. i and ii
• B. ii and iii
• C. iii and iv
• D. iv and i

Answer 1

The correct option is B ii and iii

RNA was the first genetic material to evolve. There is enough evidence to suggest that essential life processes such as metabolism, translation and splicing evolved around RNA. RNA can act as a genetic material as well as a catalyst. There are some very important biochemical reactions in living systems that are catalysed by RNA catalysts and not by protein enzymes. RNA is relatively more reactive than DNA and hence unstable. Therefore, DNA has evolved from RNA with chemical modifications that make it more stable.