| Date | May 2012 | Marks available | 1 | Reference code | 12M.1.SL.TZ2.5 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | State | Question number | 5 | Adapted from | N/A |
Question
What is the approximate thickness of the plasma membrane of a cell?
A. 10 nm
B. 50 nm
C. 10 µm
D. 50 µm
Markscheme
A
Examiners report
Although this question discriminated well, a large proportion of candidates chose option C instead of the correct response of A (10nm). It was thought that students were confusing the different units used in those two options.
