| Date | May 2016 | Marks available | 1 | Reference code | 16M.1.SL.tz0.5 |
| Level | Standard Level | Paper | Paper 1 | Time zone | time zone 0 |
| Command term | Which | Question number | 5 | Adapted from | N/A |
Question
Which of the following applies to hemoglobin?
A. It binds strongly to oxygen when there is a low partial pressure
B. It is an iron compound
C. It transports approximately 80 % of oxygen in the blood
D. It is a component of white blood cells
Markscheme
B
Examiners report
The most difficult question on the paper. C was the main distractor and A was the 2nd distractor. More candidates chose C or A than B (correct response). It was highlighted in one of the G2s that the term ‘iron compound’ (B) was misleading, it should have been ‘iron-containing’.
