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Question 18M.2.HL.TZ1.a

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Date May 2018 Marks available [Maximum mark: 4] Reference code 18M.2.HL.TZ1.a
Level HL Paper 2 Time zone TZ1
Command term Draw Question number a Adapted from N/A
a.
[Maximum mark: 4]
18M.2.HL.TZ1.a

Draw a labelled diagram to show the fluid mosaic model of the plasma membrane.

[4]

Markscheme

a. two correctly orientated layers of phospholipids/phospholipid bilayer shown withheads facing in opposite directions 

b. phospholipids shown with two parts labelled hydrophilic/phosphate head AND hydrophobic/hydrocarbon tail

c. protein (any) shown as a globular structure embedded in one/both layers of phospholipid 

d. peripheral protein shown as globular structures at the surface of the membrane AND integral protein shown as embedded globular structures 

e. glycoprotein shown as embedded globular structure with antenna-like carbohydrateprotruding 

OR 

carbohydrate shown as branched/antenna-like structure attached either to a protein or to a phospholipid 

OR 

channel protein(s) shown with a pore passing through it 

OR 

pump protein shown as a transmembrane globular structure 

f. cholesterol shown in between adjacent phospholipids 

Do not award the mark unless the structure is labelled with the underlined name. 

 

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