| Date | May 2016 | Marks available | 1 | Reference code | 16M.1.HL.TZ0.8 |
| Level | Higher level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Deduce | Question number | 8 | Adapted from | N/A |
Question
The image represents a model of the protein transthyretin.
Which level of structure is indicated by X on the image?
A. Primary
B. Secondary
C. Tertiary
D. Quaternary
Markscheme
B
Examiners report
This question proved to be a very good discriminator. Some teachers complained that the structure was showing a bit of a loop, therefore they believed the answer should have been tertiary structure instead of secondary structure. In the diagram it is clear that the entire model is of a tertiary structure of a protein and that the box is only showing a bit of an alpha helix, therefore the secondary structure is being shown.
