DP Biology (first assessment 2025)

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Question 21M.1A.SL.TZ2.24

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.1A.SL.TZ2.24
Level SL Paper 1A Time zone TZ2
Command term Question number 24 Adapted from N/A
24.
[Maximum mark: 1]
21M.1A.SL.TZ2.24

The electron micrograph shows a transverse section through a myelinated neuron.

[Source: Transmission electron micrograph of a myelinated axon. https://commons.wikimedia.org/wiki/File:Myelinated_neuron.jpg. This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license (https://creativecommons.org/licenses/by-sa/3.0/deed.en).]

What process is facilitated by the presence of the structure labelled X?

A. Repolarization of the nerve cell membrane

B. Generation of an action potential

C. Saltatory conduction

D. Synaptic transmission

[1]

Markscheme

C

Examiners report

This question discriminated well with the stronger candidates answering correctly and the weaker candidates selecting response D Synaptic transmission.

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