Question

which of the following best describes an enzyme?
molecule that increases the energy released by a chemical reaction
molecule that decreases the product of a chemical reaction
molecule that increases the rate of a chemical reaction
starting molecule that is changed into a product during a chemical reaction

Explanation:

Enzymes are biological catalysts. Catalysts increase the rate of a chemical - reaction without being consumed in the reaction or changing the energy released or the amount of product formed. The starting molecule in a reaction is a substrate, not an enzyme.

Answer:

Molecule that increases the rate of a chemical reaction