Question

enzymes are
multiple choice
lipids.
proteins.
carbohydrates.
nucleic acids.
steroids

Explanation:

Enzymes are biological catalysts, and most enzymes are proteins (some are RNA, but the primary category here is proteins). Lipids are fats, carbohydrates are sugars/starch, nucleic acids are DNA/RNA, and steroids are a type of lipid. So the correct category for enzymes (in terms of macromolecule) is proteins.

Answer:

B. proteins (assuming the second option is labeled B; if the options are unlabeled by letter, the option with "proteins" is the correct one)