| Date | May 2010 | Marks available | 1 | Reference code | 10M.1.SL.TZ1.7 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | State | Question number | 7 | Adapted from | N/A |
Question
Which substance in prokaryotes contains sulfur?
A. DNA
B. Phospholipids
C. Proteins
D. Antibiotics
Markscheme
C
Examiners report
Although very few candidates did go for option D, some teachers commented on G2s that some antibiotics contain sulfur. This is true, but generally antibiotics are not found in prokaryotes. The most correct answer was then proteins. Surprisingly many candidates answered phospholipids, showing that they did not know the structure of these chemicals.
