EvolutionEasyBloom L6
Question
Which of the following is a proposed hypothesis for the origin of genetic information?
Options
A.Early DNA molecules coded for RNA, which then catalyzed the production of proteins.
B.Early polypeptides became associated with RNA bases, and a catalyst linked the bases into RNA molecules.
C.Short RNA strands were capable of self replication and evolved by the natural selection of molecules that were most stable and autocatalytic.
D.As protobionts grew and split, they distributed copies of their molecules to their offspring.
Solution
Sol.(c) [Key Concept: RNA World Hypothesis — Self-replicating RNA] The 'RNA world' hypothesis proposes that short RNA strands were capable of self-replication and had catalytic activity (ribozymes). These RNA molecules evolved by natural selection, with the most stable and autocatalytic sequences surviving and replicating preferentially, eventually leading to more complex genetic systems.
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