Item BF001005: During digestion, protein, complex carbohydrate, and fat molecules in the food we eat are broken down into smaller subunits.

During digestion, what happens to the protein, complex carbohydrate, and fat molecules in food?

  1. They are broken down into other protein, complex carbohydrate, and fat molecules.
  2. They are broken down into carbon dioxide and water.
  3. They are broken down into smaller molecules (subunits).
  4. Nothing happens to them.  Other molecules are broken down during digestion but not protein, complex carbohydrate, or fat molecules.