DP Biology (first assessment 2025)

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Question 21M.2.HL.TZ2.2a.iii

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.2.HL.TZ2.2a.iii
Level HL Paper 2 Time zone TZ2
Command term Label Question number a.iii Adapted from N/A
a.iii.
[Maximum mark: 1]
21M.2.HL.TZ2.2a.iii
(a.iii)

On the diagrams, label with a letter P a location where a neonicotinoid pesticide could bind.

[1]

Markscheme

any receptor protein on post synaptic membrane marked ✔

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. 

Must unambiguously be pointed to a receptor on the synapse side. Accept labels of acetylcholinesterase.

Examiners report

Both receptor proteins and acetylcholinesterase were accepted as proteins to which acetylcholine can bind. The markscheme did not accept locations other than on the synaptic side.

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