Which of the following is false about the structure of enzymes?

Question

Every enzyme has an active site.

An enzyme can catalyze most reactions if the reactants are at a high concentration.

An enzyme’s active site is determined by the shape of the enzyme.

Enzymes speed up reaction rates.

Answer 1

The statement that is false about the structure of enzymes is:

An enzyme can catalyze most reactions if the reactants are at a high concentration.

This statement is misleading because enzymes are specific in their action; each enzyme is tailored to catalyze a particular reaction or a set of closely related reactions. Simply increasing the concentration of reactants does not enable an enzyme to catalyze all reactions. Enzymes have specific active sites that fit particular substrates, and if the substrates do not match the active site, the enzyme cannot catalyze the reaction, regardless of reactant concentration.