A-LevelBiologyCell membranes and transport9700/12 · Oct/Nov 2009 · Q141 Mark
The diagram shows a red blood cell and the concentrations of ions, in mmol dm⁻³ in and in the cell. [Diagram of a red blood cell showing ion concentrations inside and outside the cell] Which ions are actively transported into and out of the cell?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Ainto cell: Cl⁻, out of cell: K⁺
Binto cell: K⁺, out of cell: Na⁺
Cinto cell: Na⁺, out of cell: Cl⁻
Dinto cell: Na⁺, out of cell: K⁺
✓ Correct answer
B: into cell: K⁺, out of cell: Na⁺
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