Download - Movement Across the Membrane-Question
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MOVEMENT OF SUBSTANCES ACROSS THE PLASMA MEMBRANE
1) Figure 1 shows the structure of the plasma membrane:
Figure 1
(a) Label the diagram above: [8m]
A. B.
C. D.
E. F.
G. H.
(b) (i) Name the model of the plasma membrane in Figure 1. [1m]
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(ii) Based on b(i), explain the characteristics of the membrane plasma. [3m]
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(iii) State the arrangement of components A and B in Figure 1. (2 marks)
F
H
D
A
B
C
E
G
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(c) (i) State the functions of the plasma membrane. [2m]
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(ii) State the function of D in the Figure 1. [1m]
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(iii) State the characteristics of substances that can easily pass through the phospholipid
bilayer. [1m]
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(iv) Name the process by which these substances in c(iii) cross the membrane. [1m]
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(v) Give 2 examples of such substances stated in c(iii). [2m]
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(d) (i) State the characteristics of substances that find difficulty going through the
phospholipid bilayer. [1m]
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(ii) Name 2 examples of such substances mentioned in d (i) above. [2m]
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(2) Figure 2 shows two solutions separated by a semi-permeable membrane.
(a) (i) Complete the diagram to show what happens after 2 hours. [2 m]
Semi-permeable
membrane
9.00 am 11.00 am
Note : = water molecule
= sucrose molecule
Figure2
(ii) Name the process that takes place in a(i): [1 m]
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(iii) Define the process you have named in a(ii): [2m]
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(iv) Name two processes in living organisms which use the process in a(ii) [2m]
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(b) How do the pore proteins carry out their functions? [1m]
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(c) Compare how carrier proteins help in active transport and passive transport.
Active transport: [4m]
A B A B
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Passive transport: [4m]
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(d) A red blood cell is placed into the following mediums. State you observation. [3m]
(i) hypotonic solution:
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(ii) isotonic solution:
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(iii) hypertonic solution:
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(e) What happens when a plant cell is placed into a : [3m]
(i) hypotonic solution?
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(ii) isotonic solution?
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(iii) hypertonic solution?
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(iv) What happens when the plant cell in e(iii) is placed in hypotonic solution? [3m]
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(f) Why do we use salt to preserve fish? [3m]
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( g) Figure 3 shows different modes of transport across the plasma membrane.
Complete the figure: [6m]
Figure 3
MOVEMENT OF SUBSTANCES
ACROSS THE PLASMA MEMBRANE
PASSIVE TRANSPORT
Assisted by (D) ______________ proteins
A)
Osmosis B) C)
Assisted by
E) ________proteins
F) ________proteins
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