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Date May 2019 Marks available 1 Reference code 19M.1.SL.TZ2.5
Level Standard level Paper Paper 1 Time zone Time zone 2
Command term Determine Question number 5 Adapted from N/A

Question

The table shows concentrations of potassium ions and sodium ions inside and outside human cells.

[Source: © International Baccalaureate Organization 2019]

 

What explains these concentrations?

A. Potassium ions diffuse in and sodium ions diffuse out.

B. Sodium ions diffuse in and potassium ions diffuse out.

C. Active transport pumps sodium ions in and potassium ions out.

D. Active transport pumps sodium ions out and potassium ions in.

Markscheme

D

Examiners report

[N/A]

Syllabus sections

Core » Topic 1: Cell biology » 1.4 Membrane transport
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