CAIE IGCSE Biology 7.4.7 Digestion of Protein By Proteases Questions

Practise comparing protein digestion by pepsin in the acidic stomach with trypsin action in the alkaline small intestine and duodenum.

Exam points

identify pepsin as the protease that begins protein digestion in the stomach
state that trypsin digests protein in alkaline conditions in the duodenum or small intestine
use tables or pH evidence to link trypsin action with amino-acid products

[Maximum number: 2]

Pepsin is a protease enzyme found in the alimentary canal.

(a)

State the organ in the alimentary canal where pepsin is secreted.

[ 1 ]

(b)

The same experiment was performed with trypsin, another protease enzyme.

Predict the optimum pH for trypsin.

[ 1 ]

$(\mathrm{pH}) 8 \pm 1$ ;

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