A mixture contains starch and protein. Enzyme X breaks down starch only. Enzyme Y breaks down protein only.
Both enzymes are added under suitable conditions and the reactions are allowed to finish.
Which statement describes the products and explains why two enzymes are needed?
Sugars and fatty acids form; X and Y have differently shaped active sites.
Sugars and amino acids form; X and Y are each used up by one substrate.
Sugars and fatty acids form; X and Y are each used up by one substrate.
Sugars and amino acids form; X and Y have differently shaped active sites.
44 exam-style questions on Edexcel GCSE Biology 1.3 Enzymes, covering 1.3.1 Mechanism of enzyme action, 1.3.2 Denaturation of enzymes, 1.3.3 Factors affecting enzyme activity, and 1.3.4 Measuring energy in food by calorimetry. Each one has a worked solution and a mark scheme showing where the marks go.