DP Biology (first assessment 2025)

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Question 23M.1A.SL.TZ1.29

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Date May 2023 Marks available [Maximum mark: 1] Reference code 23M.1A.SL.TZ1.29
Level SL Paper 1A Time zone TZ1
Command term Question number 29 Adapted from N/A
29.
[Maximum mark: 1]
23M.1A.SL.TZ1.29

What occurs during the establishment of a resting membrane potential of a neuron?


A.  Both sodium and potassium ions are pumped outside the neuron.

B.  Sodium ions are pumped out while potassium ions are pumped into the neuron.

C.  Both sodium and potassium ions are at rest inside the membrane of the neuron.

D.  Sodium ions leave by diffusion and potassium ions enter the neuron by active transport.

[1]

Markscheme

B

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