Biology · Oct / Nov 2021 · Paper 41 · Question 3

any three from:

protease / trypsin / pepsin ;

chemical) digestion ;

(protein) digested to amino acids ;

insoluble to soluble molecules ;

any four from:

enzymes have, a specific shape / complementary shape to substrate ;

correct ref. to active site ;

30°C is optimum temperature ;

above 50 °C (these) enzymes denature ;

ref. to active site changing (shape) ;

(below 30 °C,) less kinetic energy / lower frequency of effective collisions (between substrate and enzyme) ; ora

any four from:

emulsification ;

increased surface area of fat (globules) ;

faster, digestion / breakdown (of fat) ;

by lipase / to fatty acids and glycerol ;

neutralises, (stomach) acid / chyme / gastric juice ;

alters / increases, pH for (pancreatic / intestinal) enzymes / AW ;

denatures, pepsin / stomach, enzymes ;

AVP ;