| Date | May 2015 | Marks available | 2 | Reference code | 15M.3.SL.TZ2.8 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 2 |
| Command term | Outline | 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.
