Biology · Oct / Nov 2022 · Paper 41 · Question 2

any two from:

become soluble ;

for absorption ;

small enough, for diffusion / active transport ;

water ;

any six from:

1

protein → amino acids ;

2

ref to specificity ;

3

both enzymes are active between pH 3 and pH5 ; A at pH4 4

A is pepsin ;

5

optimum pH at 2 ;

6

enzyme shows, no activity / is denatured, from pH 5 ; 7

(functions) in stomach ;

8

where HCl is present / in acid conditions ;

9

B is trypsin ;

10 optimum pH at 10 ;

11 enzyme shows, no activity / is denatured, from pH 3 ; 12 (functions) in small intestine / secreted from pancreas ; 13 bile neutralises (stomach) acid / in alkaline conditions ;

(membrane of) epithelium ;