Question

question 18 of 22
what is an enzyme?
a. a protein that speeds up chemical reactions in a living thing
b. a long chain of amino acids
c. the specific molecule that binds to a catalyst
d. a molecule that carries genetic information

Explanation:

Enzymes are biological catalysts. Catalysts speed up chemical reactions. Enzymes are proteins. So, an enzyme is a protein that speeds up chemical reactions in a living thing. Option B describes a protein in a general sense (not specifically an enzyme). Option C is incorrect as enzymes are the catalysts (not the molecule binding to a catalyst). Option D describes nucleic acids (like DNA) which carry genetic information.

Answer:

A. A protein that speeds up chemical reactions in a living thing