| Date | November 2012 | Marks available | 1 | Reference code | 12N.1.HL.TZ0.20 |
| Level | Higher level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Question number | 20 | Adapted from | N/A |
Question
The diagram shows events at a synapse.
What is happening at the point labelled X?
A. Neurotransmitter binding
B. Ca2+ diffusing
C. Neurotransmitter moving across synapse
D. Na2+ binding
Markscheme
B
Examiners report
N/A
Syllabus sections
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