LII-ralli

Which statement best explains how enzymes speed up chemical reactions?

Enzymes use light energy to speed up chemical reactions.

Enzymes gain heat from chemical reactions.

Enzymes change shape during chemical reactions.

activation energy of a reaction.

Enzymes change shape during chemical reactions. activation energy of a reaction.

Explanation:

Enzymes speed up chemical reactions by reducing the activation energy of the reactants. The substrate fits in the active site on the surface of the enzyme. The enzyme change shape during chemical reaction by the formation of an enzyme-substrate complex.