Question

which statement about enzymes is true?
an enzyme functions to decrease the rate of a chemical reaction.
enzymes are proteins that function as catalysts in nonliving things.
each enzyme can catalyze many different biochemical reactions.
enzymes and substrates fit together like a lock and key.

Explanation:

Enzymes are proteins that function as catalysts in non - living things is incorrect as enzymes are biological catalysts in living organisms. Enzymes function to decrease the rate of a chemical reaction is wrong as they increase the rate. Enzymes and substrates fit together like a lock and key is a correct description of enzyme - substrate specificity. Each enzyme can catalyze many different biochemical reactions is incorrect as enzymes are specific to their substrates.

Answer:

Enzymes and substrates fit together like a lock and key.