Question

which proteins build up or breakdown substances in cells?
□ enzyme
□ starch
□ lipids
□ rewatch

Explanation:

Enzymes are proteins that act as biological catalysts, speeding up chemical reactions in cells which include building up (anabolic) or breaking - down (catabolic) substances. Starch is a carbohydrate, not a protein. Lipids are a different class of biomolecules from proteins.

Answer:

Enzyme