Amylase breaks down starch but not protein. This is because

  1. protein does not fit amylase's active site
  2. amylase is denatured by protein
  3. protein is too small
  4. protein is not a food
Answer

A) protein does not fit amylase's active site

Enzymes are specific to their substrate's shape. O Level Biology · Topic 5 Enzymes · 5.1 Enzyme action

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