Question

multiple - choice question
an enzyme is considered ______ because it speeds up chemical reactions without being used up.
denatured
a substrate
a catalyst
a cofactor
a complex

Explanation:

Enzymes are biological catalysts. They increase the rate of chemical reactions without being consumed in the reaction, which is the definition of a catalyst. Denatured refers to an enzyme losing its structure and function. A substrate is a molecule upon which an enzyme acts. A co - factor is a non - protein molecule or ion that helps an enzyme in its activity. A complex is a general term for a combination of molecules.

Answer:

C. a catalyst