A-Level Biology Specification

AQA 7402

Section 3.3: Digestion and absorption

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#3.3.1

During digestion, large biological molecules are hydrolysed to smaller molecules that can be absorbed across cell membranes.

#3.3.2

Digestion in mammals of:

- carbohydrates by amylases and membrane-bound disaccharidases
- lipids by lipase, including the action of bile salts
- proteins by endopeptidases, exopeptidases and membrane-bound dipeptidases.

#3.3.3

Mechanisms for the absorption of the products of digestion by cells lining the ileum of mammals, to include:

- co-transport mechanisms for the absorption of amino acids and of monosaccharides
- the role of micelles in the absorption of lipids.