DP Biology (first assessment 2025)

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Question 22M.1A.HL.TZ2.28

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1A.HL.TZ2.28
Level HL Paper 1A Time zone TZ2
Command term Question number 28 Adapted from N/A
28.
[Maximum mark: 1]
22M.1A.HL.TZ2.28

The diagram shows the synaptic transmission of nerve impulses by the neurotransmitter acetylcholine. 

[Source: Zhang, X. A Mathematical Model of a Neuron with Synapses based on Physiology. Nat Prec (2008).
https://doi.org/10.1038/npre.2008.1703.1 available at https://www.nature.com/articles/npre.2008.1703.1
Source adapted.]

 

What is the fate of acetylcholine immediately after binding to the receptor?

A. It is pumped into the postsynaptic neuron.

B. It diffuses into the presynaptic neuron.

C. It is broken down in the synaptic cleft.

D. It binds to another receptor in the postsynaptic neuron.

[1]

Markscheme

C

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