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 biological catalysts that increase the rate of chemical reactions, so the first option is wrong.
• Enzymes are proteins that function as catalysts in living things, not non - living things, so the second option is wrong.
• Each enzyme is specific and can usually catalyze only one or a few similar biochemical reactions, so the third option is wrong.
• The lock - and - key model describes how enzymes (lock) and substrates (key) fit together specifically.

Answer:

Enzymes and substrates fit together like a lock and key.