O-LevelBiologyTransport in Humans5090/11 · Oct/Nov 2010 · Q211 Mark

The diagram shows the structures associated with a human kidney. [Diagram] What are the relative concentrations of urea in X, Y and Z?

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.

AX is sometimes higher than Y

BY is always higher than Z

CY is always lower than Z

DZ is sometimes lower than X

✓ Correct answer

C: Y is always lower than Z

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Topic: Transport in Humans, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2010 Paper 1 Variant 1, question 21.

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