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Date November 2018 Marks available 2 Reference code 18N.2.HL.TZ0.2
Level Higher level Paper Paper 2 Time zone TZ0 / no time zone
Command term Identify Question number 2 Adapted from N/A

Question

Label a peptide bond in the diagram of a polypeptide.

[1]
a.i.

Outline the primary structure of proteins.

[1]
a.ii.

Identify two hydrolysis reactions that occur in the small intestine.

[2]
b.

Markscheme

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

a.i.

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

a.ii.

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 ✔

b.

Examiners report

[N/A]
a.i.
[N/A]
a.ii.
[N/A]
b.

Syllabus sections

Core » Topic 2: Molecular biology » 2.1 Molecules to metabolism
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Core » Topic 2: Molecular biology
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