| Date | May 2011 | Marks available | 1 | Reference code | 11M.1.SL.TZ1.27 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 27 | Adapted from | N/A |
Question
Which of the following statements about antibodies is correct?
A. Antibodies are polypeptides.
B. Antibodies are produced by the bone marrow.
C. Antibodies are pathogenic foreign substances.
D. Antibodies kill bacteria but not viruses.
Markscheme
A
Examiners report
There were some comments about this question on the G2 forms. It was suggested that protein could be confused with polypeptides, but students should know the relationship between the two. It was felt that perhaps the wording of D was not good (as viruses are nonliving) and many students picked this option. However, candidates should have been able to eliminate options C and D when making their decisions.
