Question

which statement about enzymes is true? each catalyzes reactions of a broad range of substrates. they lower the free energy of the products. they are only rarely regulated. they are not permanently altered by the reactions they catalyze. they catalyze reactions by raising activation energy.

Explanation:

Enzymes are biological catalysts. They lower the activation - energy of reactions, are highly specific in the reactions they catalyze, and are often regulated. They are not permanently altered by the reactions they catalyze.

Answer:

They are not permanently altered by the reactions they catalyze.