DP Biology (first assessment 2025)

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Question 22M.1A.SL.TZ2.25

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1A.SL.TZ2.25
Level SL Paper 1A Time zone TZ2
Command term Question number 25 Adapted from N/A
25.
[Maximum mark: 1]
22M.1A.SL.TZ2.25

Many blood-feeding insects inject an anticoagulant into their host in order to prevent blood from clotting. Female mosquitoes of the genus Anopheles inject the anticoagulant anophelin, which inhibits the action of the enzyme thrombin. Which statement explains how anophelin prevents blood clotting?

A. Platelets are no longer produced.

B. Platelets cannot produce fibrin.

C. Fibrinogen is not converted to fibrin.

D. Prothrombin is not converted to thrombin.

[1]

Markscheme

C

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