Question

question 4 when food is being digested and broken down into its constituent molecules, which macromolecular subunits are re-used to make enzymes? a sugars from carbohydrates b amino acids from proteins c fatty acids from fats d nucleotides from nucleic acids e all of the above.

Explanation:

Enzymes are mostly proteins (with some being RNA, but the main ones are protein - based). Proteins are made up of amino acids. When proteins in food are digested, they are broken down into amino acids. These amino acids can then be reused to synthesize enzymes (which are proteins).

• Option A: Sugars from carbohydrates are used to make carbohydrates or for energy, not enzymes (since enzymes are not made of sugars).
• Option C: Fatty acids from fats are used for fat - related structures or energy, not for making enzymes.
• Option D: Nucleotides from nucleic acids are used to make nucleic acids (DNA, RNA), not enzymes (except for ribozymes which are RNA, but the main enzyme type is protein - based and the question is about the general case of enzyme synthesis from digested food subunits).
• Option E: Since A, C, D are incorrect, E is also incorrect.

Answer:

B. amino acids from proteins