Which of the following statements best describe how enzymes differ from ordinary chemical catalysts? a) enzymes are inorganic in nature. b) enzymes catalyze select chemical reactions. c) enzymes bind their substrates for for a brief time. d) enzymes increase the rate of a chemical reaction.

A catalyst is a chemical substance that is used to alter the rate of a chemical reaction without being changed or involved in this reaction.

An enzyme is essential biological macro-molecule that is used to catalyze biological reactions only.

Therefore, they key difference between a catalyst and an enzyme is:
B) Enzymes catalyze select chemical reactions.

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