DP Biology (last assessment 2024)

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Question 22N.2.SL.TZ0.b

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.2.SL.TZ0.b
Level SL Paper 2 Time zone TZ0
Command term Outline Question number b Adapted from N/A
b.
[Maximum mark: 1]
22N.2.SL.TZ0.b

The image shows a phospholipid bilayer that is a component of the cell membrane.

[Source: Boundless Learning. Course Hero. Phospholipids. [diagram online] Available at:
https://www.coursehero.com/study-guides/introchem/phospholipids/ [Accessed 1 November 2021].]

Outline a function of cholesterol in cell membranes.

[1]

Markscheme

reduces fluidity of membrane / reduces permeability of membrane (to some molecules);

Accept ‘controls’ or ‘maintains ‘ as a BOD.

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