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1.4 Transport across cell membranes

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Question 27
H

Two identical cells contain substance X at a concentration of 6 arbitrary units. Cell P is placed in an external concentration of 2 units. Cell Q is placed in an external concentration of 10 units. X can cross both cell membranes by diffusion.

Energy supply for active transport is stopped in both cells. The initial concentrations are otherwise unchanged.

What are the initial net movements of X?

[1]
A

out of P and out of Q

B

into P and into Q

C

out of P and into Q

D

into P and out of Q

Markscheme

1.4 Transport across cell membranes Questions

  1. GCSE
  2. /Biology
  3. /1.4 Transport across cell membranes

41 exam-style questions on Edexcel GCSE Biology 1.4 Transport across cell membranes, covering 1.4.1 Transport into and out of cells and 1.4.2 Percentage gain and loss in osmosis. Each one has a worked solution and a mark scheme showing where the marks go.

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