An enzyme

A) has a two-dimensional shape.
B) is permanently changed in a chemical reaction.
C) increases the activation energy needed in a chemical reaction.
D) is a protein catalyst.
E) cannot be denatured.

Enzyme

Biomolecules that act as catalysts, speeding up specific biochemical reactions in the body without being consumed in the process.

Protein Catalyst

Enzymes that significantly speed up the rate of virtually all of the chemical reactions that take place within cells.

Chemical Reaction

A process that involves rearrangement of the molecular or ionic structure of substances, not involving a change in physical state.