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Question 19N.2.SL.TZ0.a

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Date November 2019 Marks available [Maximum mark: 4] Reference code 19N.2.SL.TZ0.a
Level SL Paper 2 Time zone TZ0
Command term Draw Question number a Adapted from N/A
a.
[Maximum mark: 4]
19N.2.SL.TZ0.a

Draw a section of the Singer-Nicolson model of an animal cell membrane.

[4]

Markscheme

a. bilayer of phospholipids with both “tails” towards the inside «of the bilayer» ✔ This can be taken unlabeled from diagram.

b. hydrophilic/polar and hydrophobic/non-polar annotation ✔

c. cholesterol between phospholipid tails ✔

d. glycoprotein ✔

e. integral proteins/channel proteins ✔

f. peripheral proteins ✔ Allow this if it does not extend across the membrane

Elements should be clearly drawn, correctly positioned and annotated.

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