DP Biology (first assessment 2025)

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Question 20N.2.SL.TZ0.a.i

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Date November 2020 Marks available [Maximum mark: 2] Reference code 20N.2.SL.TZ0.a.i
Level SL Paper 2 Time zone TZ0
Command term Outline Question number a.i Adapted from N/A
a.i.
[Maximum mark: 2]
20N.2.SL.TZ0.a.i

Outline how the amphipathic properties of phospholipids play a role in membrane structure.

[2]

Markscheme

a. part hydrophobic/not attracted to water/non-polar AND part hydrophilic/attracted to water/polar;

b. bilayer formed (formed naturally by phospholipids in water);

c. hydrophilic heads/parts face outwards and hydrophobic tails/parts face inwards.

Do not allow water loving/hating in mpa or mpc.

Examiners report

Knowledge of the amphipathic properties of phospholipids was generally good.

Syllabus sections