Question

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

Explanation:

Enzymes are biological catalysts. Most enzymes are proteins, although some RNA molecules can also act as enzymes (ribozymes). But in general - context, enzymes are considered proteins. Lipids are fats and related molecules, carbohydrates are sugars and starches, steroids are a type of lipid, and nucleic acids are DNA and RNA.

Answer:

D. proteins