Question

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

Explanation:

1. Analyze the first statement: Enzymes are specific, usually each enzyme catalyzes one (or a few related) biochemical reactions, not many different ones. So this is false.
2. Analyze the second statement: Enzymes are proteins (most of them) that function as catalysts in living organisms (they are part of living systems, not nonliving things). So this is false.
3. Analyze the third statement: Enzymes function to increase the rate of a chemical reaction (they are catalysts, which speed up reactions), not decrease. So this is false.
4. Analyze the fourth statement: The lock - and - key model is a common way to describe how enzymes and their specific substrates fit together, where the enzyme's active site (lock) and the substrate (key) have complementary shapes. This statement is true.

Answer:

Enzymes and substrates fit together like a lock and key.