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(D) The $RNA$ world hypothesis suggests that $RNA$ was the first genetic material and performed both catalytic and informational functions. Evidence f

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All of these

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(D) The $RNA$ world hypothesis suggests that $RNA$ was the first genetic material and performed both catalytic and informational functions. Evidence for the $RNA$ world includes the fact that many essential cellular processes,such as $RNA$ splicing,are catalyzed by $RNA$ molecules (ribozymes). Processes like $5'$ capping and $3'$ polyadenylation are also essential post-transcriptional modifications that involve $RNA$ processing machinery,reflecting the ancient role of $RNA$ in gene expression and regulation. Since all these processes ($Capping$,$Splicing$,and $Polyadenylation$) rely on $RNA$-based mechanisms,they collectively support the dominance of the $RNA$ world.

Dominance of $RNA$ world is proved by

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