Biology · May / June 2026 · Paper 41 · Question 2

amylase - mouth / small intestine ;

pepsin – stomach ;

1

test-tube 1 turns red and test-tube 2, stays blue / does not change ; plus any four from:

test-tube 1

2

amylase breaks down starch into (named) reducing sugar ;

3

(shape of the) active site of amylase is complementary to starch ; 4

enzyme-substrate complexes are formed ;

test-tube 2

5

pepsin does not break down starch / pepsin breaks down proteins ; 6

(shape of the) active site of pepsin is not complementary to starch ; 7

no enzyme-substrate complexes are formed ;

carbon and hydrogen and oxygen ;

large molecule

small molecules

glycogen

glucose

cellulose

glucose

protein

amino acids

fats / oils

fatty acids and glycerol

;;

in assimilation nutrients are, taken up / used, by cells ;

in absorption nutrients are moved from the intestines to the blood ;