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9700 As level ch4 p1 topical
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9700 As biology Chap 4 — cell membrane MCQs topical All variants
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Topic 4: cell membranes and transport AS Biology Topical Paper 19700/1/O/N/02/Q4
1 Freshly cut potato chips are immersed for 30 minutes in four sucrose solutions of varying water
potentials.
The graph shows the percentage change in their length.
8
7
6
5
4
3
2 % change
water potential of sucrose solution (kPa) 1 in
0
–3000 –2500 –2000 –1500 –1000 –500 –1 length
–2
–3
–4
–5
–6
–7
–8
What is the water potential of the potato cells in the freshly cut chips?
A 0 kPa C – 875 kPa
B – 525 kPa D – 2500 kPa
9700/1/O/N/02/Q6
2 The diagram shows part of a cell surface membrane.
X
W Y
outside
Z
inside
Four functions of the membrane are listed:
1 allows fat-soluble molecules through membrane
2 allows cell recognition
3 maintains constant shape of membrane
4 pumps ions through membrane
Which part is correctly paired with its function?
A W and 1 B X and 2 C Y and 3 D Z and 4
Rasheed A. Chattha
, Topic 4: cell membranes and transport AS Biology Topical Paper 1
3 The diagram shows a molecule that is found in cell surface membranes. 9700/1/O/N/02/Q10
Y
X
Z
What is present at X, Y, and Z?
X Y Z
A phosphate double-bond carbon chain protein
B phosphate single-bond carbon chain double-bond carbon chain
C protein glucose single-bond carbon chain
D protein phosphate glucose
9700/1/M/J03/Q4
4 Strips of plant tissue were immersed in a range of sucrose solutions of different concentrations.
Their lengths were measured before immersion and after 30 minutes in the different solutions.
The graph shows the ratio of initial length to final length.
1.4
1.2
1.0
initial length
final length
0.8
0.6
0.4
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
sucrose concentration / mol dm–3
Which concentration of sucrose solution, in mol dm–3, has the same water potential as the cell sap
before immersion?
A 0.1 B 0.25 C 0.45 D 0.8
Rasheed A. Chattha
, Topic 4: cell membranes and transport AS Biology Topical Paper 1
5 The diagram shows a section of a cell surface membrane. 9700/1/M/J03/Q5
head phospholipid
tail molecule
What causes the phospholipid molecules to be arranged as shown?
A The heads are hydrophilic and point towards water molecules.
B The heads are hydrophobic and point away from water molecules.
C The tails are hydrophilic and point away from water molecules.
D The tails are hydrophobic and point towards water molecules.
9700/1/M/J03/Q6
6 Many fresh water animals possess vacuoles which contract regularly, expelling excess water.
6 Man
Why do plants living in fresh water not require such vacuoles?
Wh
A Plant cell sap has a much lower concentration of dissolved solutes than animal cytoplasm.
A
B Plant cell walls are impermeable to water.
B
C The water potential is the same inside and outside the plant cells.
C
D Water movement into plants is controlled by their roots.
D W
9700/1/M/J03/Q7
7 The drawing has been made from a section showing part of an alveolus and a red blood cell in a
7 The dra The magnification of the drawing is × 5000
capillary.
capillary
alveolus
red blood cell
What is the minimum distance that oxygen must diffuse from air in an alveolus into a red blood
cell?
cell?
A 0.1 nm
A 0.1
B 1.0 nm
B 1.0
C 0.1 µm
D 1.0 µm
Rasheed A. Chattha
, Topic 4: cell membranes and transport AS Biology Topical Paper 1
8 What is a role of essential fatty acids in the body? 9700/1/M/J03/Q27
A as part of glycoproteins in cell membranes
B as part of phospholipids in cell membranes
C to use for enzyme formation
D to use for RNA formation
9 The diagram shows several processes taking place in a cell. 9700/01/O/N/03/Q1
Which processes are shown in the diagram and involve the cell surface membrane of the cell?
A active transport and diffusion C endocytosis and exocytosis
B diffusion and osmosis D endocytosis and osmosis
10 The diagram shows part of a cell surface membrane. 9700/01/O/N/03/Q2
X
Y
Z
Which labels are correct?
glycoprotein phospholipid protein
A X Y Z
B Y Z X
C Y X Z
D Z Y X
Rasheed A. Chattha
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