Question

Which statement about enzymes is true? A. An enzyme functions to increase the rate of a chemical reaction. B. Enzymes are proteins that function as catalysts in nonliving things. C. Each enzyme can catalyze many different biochemical reactions. D. Enzymes and substrates fit together like a lock and key.

Answer 1

A. An enzyme functions to increase the rate of a chemical reaction.
 
  First, the basic function of an enzyme is to increase the rate of a reaction. Most cellular reactions occur about a million times faster than they would in the absence of an enzyme.