DP Biology (first assessment 2025)

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Question 21M.1A.HL.TZ1.22

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.1A.HL.TZ1.22
Level HL Paper 1A Time zone TZ1
Command term Question number 22 Adapted from N/A
22.
[Maximum mark: 1]
21M.1A.HL.TZ1.22

Which statement applies to an axon at rest?

A. There is no electric potential difference between the external and internal surfaces of the plasma membrane.

B. The external surface of the plasma membrane is positive relative to the internal surface.

C. The external surface of the plasma membrane is negative relative to the internal surface.

D. The internal surface of the plasma membrane has a much higher concentration of sodium ions.

[1]

Markscheme

B

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