| Date | November 2012 | Marks available | 1 | Reference code | 12N.1.HL.TZ0.24 |
| Level | Higher level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Question number | 24 | Adapted from | N/A |
Question
The diagram is a three-dimensional molecular model of a protein.
Which bonds stabilize the shape of the area labelled X?
A. Covalent bonds between adjacent amino acids
B. Hydrogen bonds between N–H and C=O groups of amino acids
C. Hydrophobic interactions between R groups of amino acids
D. Disulphide bridges between cysteine molecules
Markscheme
B
Examiners report
N/A
