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Question 18M.2.SL.TZ2.5a

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Date May 2018 Marks available [Maximum mark: 4] Reference code 18M.2.SL.TZ2.5a
Level SL Paper 2 Time zone TZ2
Command term Draw Question number a Adapted from N/A
a.
[Maximum mark: 4]
18M.2.SL.TZ2.5a

Every cell is surrounded by a cell surface membrane which regulates the movement of materials into and out of the cell.

(a)

Draw an annotated diagram of the fluid mosaic model of membrane structure.

[4]

Markscheme

a. phospholipid bilayer – with head and tails 

b. hydrophilic/phosphate/polar heads AND hydrophobic/hydrocarbon/fattyacid/non-polar tails labelled. Both needed.

c. integral/intrinsic protein – embedded in the phospholipid bilayer 

d. protein channel – integral protein showing clear channel/pore 

e. peripheral/extrinsic protein – on the surface 

f. glycoprotein with carbohydrate attached 

g. cholesterol – shown embedded in bilayer

Award [1] for each structure clearly drawn and correctly labelled.

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