O-LevelBiologyTransport in Humans5090/11 · Oct/Nov 2025 · Q171 Mark

What happens during blood clotting?

AInsoluble fibrin is converted to soluble fibrinogen.

BInsoluble fibrinogen is converted to soluble fibrin.

CSoluble fibrin is converted to insoluble fibrinogen.

DSoluble fibrinogen is converted to insoluble fibrin.

✓ Correct answer

D: Soluble fibrinogen is converted to insoluble fibrin.

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Topic: Transport in Humans, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2025 Paper 1 Variant 1, question 17.

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