Label a peptide bond in the diagram of a polypeptide.

Outline the primary structure of proteins.

Identify two hydrolysis reactions that occur in the small intestine.

Award [1] for any one of the four peptide bonds identified in this markscheme.

number/sequence/order of amino acids «in a protein/polypeptide chain» ✔

a. polysaccharides to disaccharides/monosaccharides
OR
starch/glycogen to maltose ✔

b. sucrose to glucose AND fructose ✔

c. maltose to glucose ✔

d. lactose to glucose AND galactose ✔

e. proteins/peptides/polypeptides to shorter peptides/amino acids
OR
dipeptides to amino acids ✔

f. triglycerides/lipids/fats/oils to glycerol AND fatty acids ✔