Which statement best describes the function of enzymes?

A.

Enzymes aid biological reactions by providing more reactants.

B.

Enzymes aid biological reactions by removing products quickly.

C.

Enzymes raise the temperature in a cell to speed up biological reactions.

D.

Enzymes reduce the activation energies of biological reactions.

E.

Enzymes reduce the energy of products in biological reactions.

The correct option is D. Enzymes reduce the activation energies of biological reactions.

Explanation:

Enzymes are proteins that speed up the rate of a chemical reaction without being used up during the reaction. They are biological catalysts. Catalysts, as we know lower the activation energy for reactions and speed them up. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy which is option D.

D.

Enzymes reduce the activation energies of biological reactions.