Which of the following statements describes 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 a brief time.
d. enzymes increase the rate of a chemical reaction.

Options (b) is the correct answer.

Explanation:

Enzymes are the proteins which act as a catalyst in a biochemical reaction.

Whereas a catalyst is a substance with the help of which rate of a chemical reaction can be increased or decreased. Ordinary catalysts can also bind their substrates (e.g. H2 adsorption by Pd) so the correct answer would be B, since selectivity is the defining feature of enzymes.

Thus, we can conclude that enzymes catalyze select chemical reactions.

fe 55.85 g/mol and h2o 18.02 g/mol.