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Date May 2015 Marks available 3 Reference code 15M.3.SL.TZ2.8
Level Standard level Paper Paper 3 Time zone Time zone 2
Command term List Question number 8 Adapted from N/A

Question

Outline primary and quaternary protein structures.

Primary protein structure:

 

Quaternary protein structure:

 

[2]
a.

List three limiting factors of photosynthesis.

[3]
b.

Markscheme

a. (primary structure) is sequence of amino acids;
b. (quaternary structure) is the linking of two or more polypeptides to form one protein;

a.

a. temperature;
b. pH;
c. light;
d. CO2;

b.

Examiners report

Only the better candidates could give a satisfactory outline of both the primary and secondary structure of protein.

a.

N/A

b.

Syllabus sections

Core » Topic 2: Molecular biology » 2.9 Photosynthesis
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