Why Are Ribonucleases That Digest Mature Messenger RNA a Necessary

Why are ribonucleases that digest mature messenger RNA a necessary part of protein synthesis?

A) These enzymes prevent overexpression of critical proteins.
B) Without ribonucleases, messenger RNA could leave one cell type and lead to excessive protein synthesis in a different cell type.
C) When ribonucleases degrade RNA, the degradation products are recycled, making protein synthesis more energy efficient.
D) The activity of these enzymes promotes increased translation of individual messenger RNAs so that fewer RNA molecules are needed for protein production.

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