Which Protein Class Directly Controls Many of the Metabolic Reactions

Question

Which protein class directly controls many of the metabolic reactions within a cell?
A) structural proteins
B) repressor proteins
C) operator proteins
D) enzymes
E) hydrophilic proteins

Accepted Answer

Enzymes are proteins that catalyze or speed up chemical reactions within a cell. They directly control many of the metabolic reactions that occur in the cell. Structural proteins provide support and shape to the cell, repressor proteins regulate gene expression, operator proteins bind to DNA to control gene expression, and hydrophilic proteins interact with water and other substances in the cell's environment.