Question

Which compound is a reusable, complex protein that speeds up chemical reactions?

a. starch
b. a sugar
c. a lipid
d. an enzyme

Answer 1

D. Enzyme is catalytic, reusable, complex protein and is responsible for speeding up chemical reactions within cells.

Answer 2

The correct answer is option d. "an enzyme"

Step-by-step explanation:

Enzymes are naturally occurring catalysts that speed up a chemical reaction by lowering the activation energy needed for the reaction to take place. Enzymes are complex proteins in nature and are reusable since they are not denatured or destroyed as a result of the reaction. Enzymes are among the most important proteins in nature, since they regulate metabolism as well as the reactions needed for DNA replication and protein translation.