(d) RNA was the first genetic
material. There is now enough evidence to suggest that essential life processes
(such as metabolism, translation, splicing, etc.), evolved around RNA.
RNA used to act as a genetic material as
well as a catalyst (there are some important biochemical reactions in living systems
that are catalyzed 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. DNA being
double-stranded and having complementary strand further resists changes by
evolving a process of repair.
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