Question

which type of substances serves as a catalyst for reactions that break large food molecules into smaller useful molecules?
vitamins
lipids
nucleotides
enzymes

Explanation:

• Vitamins are essential nutrients but not catalysts for breaking food molecules.
• Lipids are a type of macromolecule (fats, oils) and do not act as catalysts for breaking down food molecules.
• Nucleotides are the building blocks of nucleic acids (DNA, RNA) and are not catalysts for food breakdown.
• Enzymes are biological catalysts (usually proteins) that speed up chemical reactions, including the breakdown of large food molecules (like carbohydrates, proteins, fats) into smaller, usable molecules during digestion.

Answer:

D. enzymes