DP Biology (first assessment 2025)

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Question 23M.2.HL.TZ1.2a

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Date May 2023 Marks available [Maximum mark: 2] Reference code 23M.2.HL.TZ1.2a
Level HL Paper 2 Time zone TZ1
Command term Draw Question number a Adapted from N/A
a.
[Maximum mark: 2]
23M.2.HL.TZ1.2a
(a)

Draw one phospholipid molecule on the diagram to show a possible position in the membrane.

[2]

Markscheme

phospholipid shown with circular head and 2 tails; 
e.g.

[Source: Material from: Stauch, B., Johansson, L.C., McCorvy, J.D.,
et al., Structural basis of ligand recognition at the human MT1
melatonin receptor, published 2019, Nature, reproduced with
permission of SNCSC.]

phospholipid shown in either the upper or lower half of the membrane only with its head at the margin of the membrane and tails towards centre;

Accept answers with two or more phospholipids shown, as long as all are correct.

Syllabus sections