| Date | May 2011 | Marks available | 1 | Reference code | 11M.1.SL.TZ2.17 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 17 | Adapted from | N/A |
Question
Sickle-cell anemia is caused by a mutation. How many changes to the amino acid sequence are caused by this mutation?
A. 1
B. 2
C. 3
D. 4
Markscheme
A
Examiners report
There were some criticisms of this question on the basis that there are two types of chain in hemoglobin and that this could confuse candidates but they found this to be an easy question.
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