DP Biology (first assessment 2025)

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Question SPM.1A.HL.TZ0.15

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Date May Specimen-2023 Marks available [Maximum mark: 1] Reference code SPM.1A.HL.TZ0.15
Level HL Paper 1A Time zone TZ0
Command term Question number 15 Adapted from N/A
15.
[Maximum mark: 1]
SPM.1A.HL.TZ0.15

The diagram shows the movement of ions that can occur across the membrane of a neuron.


From the diagram, what can be deduced about the movement of sodium ions?


A.  They are actively pumped out and some re-enter by facilitated diffusion.

B.  They are actively pumped out and some re-enter by simple diffusion.

C.  They diffuse out of the cell along with potassium ions.

D.  There is a net movement of sodium ions into the cell.

[1]

Markscheme

A

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