DP Biology (last assessment 2024)
Question 21M.2.HL.TZ2.2a.ii
| Date | May 2021 | Marks available | [Maximum mark: 1] | Reference code | 21M.2.HL.TZ2.2a.ii |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | Label | Question number | a.ii | Adapted from | N/A |
a.ii.
[Maximum mark: 1]
21M.2.HL.TZ2.2a.ii
Cholinergic synapses use acetylcholine as their neurotransmitter. They are widespread in the body, passing on signals to muscle cells. These synapses are affected by neonicotinoid pesticides.
The diagrams, which are not drawn to scale, show the synapse between two neurons and a detail of the synaptic cleft.
(a.ii)
On the diagrams, label with a letter E a vesicle involved in exocytosis.
[1]
Markscheme
an exocytic vesicle shown ✔
For 2 a, i, ii and iii, accept letters written on the structure even if a line is not drawn.
Award the mark if the full word is used to label the structure. Labels must be unambiguous.
Accept any of the three intact circles or the exocytosis shown within the box.
