The best answer would be enzymes since they are protein molecules and help build it. Enzymes also take part in reaction.
The answer to this question is a
RNA, in one form or another, touches nearly everything in a cell. RNA carries out a broad range of functions, from translating genetic information into the molecular machines and structures of the cell to regulating the activity of genes during development, cellular differentiation, and changing environments.
-google
<span>Nucleus. Would be your answer</span>