Given below are two statements:
Statement I: In the RNA world, RNA is considered the first genetic

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

Professor PC Thomas Classes · Answer

(c) : RNA was the first genetic material as suggested that essential life processes (such as metabolism, translation, splicing, etc.), evolved around RNA. RNA used to act as a catalyst (there are some important biochemical reactions in living systems that are catalysed by RNA catalysts and not by protein enzymes). But, RNA being a catalyst was reactive and hence unstable. Therefore, DNA has evolved from RNA with chemical modifications that make it more stable genetic material. DNA being double stranded and having complementary strand further resists changes by evolving a process of repair.