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AS Biology Chapter Test - 4
Chapter D: Cell membrane and transport
Name: Roll No.
Time: 1 hour Date:
Marks out of 50 Subject Teachers Signature Guardians
Signature
Section - A (MCQs)
1. Which pair of organelles has internal membranes?
A chloroplasts and mitochondria B chloroplasts and nuclei
C mitochondria and ribosomes D nuclei and ribosomes
2. The diagram shows a section of a cell surface membrane.
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.
3. Which process is the movement of molecules that are too large
to diffuse in through a cell surface
membrane?
A active transport B endocytosis
C facilitated diffusion D osmosis
4. An oxygen molecule diffuses directly from the air in an
alveolus to haemoglobin in a red blood cell.
What is the minimum number of cell surface membranes through
which this molecule must pass?
A 2
B 3
C 4
D 5
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5. The diagram shows part of the cell surface membrane.
Which components help to maintain the fluidity of the
membrane?
A 1 and 3 B 1 and 4
C 2 and 4 D 3 and 5
6. Which structures are surrounded by double membranes?
7. Which process is the movement of molecules that are too large
to diffuse in through a cell surface
membrane?
A active transport
B endocytosis
C facilitated diffusion
D osmosis
8. Some viruses are able to bind to the cell surface membrane
before entering the host cell. Which
sequence of events will lead to a virus invading a cell?
A binding to a cholesterol molecule, followed by endocytosis
B binding to a glycoprotein receptor, followed by exocytosis
C binding to a protein receptor, followed by endocytosis
D binding to the hydrophilic portion of a phospholipid, followed
by exocytosis
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9. The diagram represents stages in glucose uptake through a
cell surface membrane.
Which process is shown?
A active transport B facilitated diffusion
C osmosis D simple diffusion
10. What is correct for the cell surface membrane and membranes
within cells?
A Both allow intracellular transport.
B Both are stabilised by glycoproteins.
C Both have sites for enzyme attachment.
D Both protect cells from the contents of lysosomes.
Section - B (Structured Questions)
Answer ALL the questions in the space provided)
1. Fig. 1.1 shows a diagram of a plasma (cell surface)
membrane.
Fig. 1.1
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(a) Indicate, by putting a circle, around one of the following,
the width of the membrane shown in Fig.
1.1.
0.7 nm 7.0 nm 70 nm 7 105 m 700 m 7.0 m [1]
(b) Outline the functions of the following components of the
plasma membrane.
K....................................................................................................................................................................
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L
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M
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N
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[4]
(c) Some substances may cross plasma membranes by simple
diffusion. Glucose, however, does not.
Explain why glucose cannot pass across membranes by simple
diffusion.
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[2]
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(d) In an investigation, animal cells were exposed to different
concentrations of glucose. The rate of
uptake of glucose into the cells across the plasma membrane was
determined for each concentration.
Fig. 1.2 shows the results.
Fig. 1.2
Using the information in Fig. 1.2, explain how the results of
the investigation support the idea that
glucose enters cells by facilitated diffusion.
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[2]
(e) State how active transport differs from facilitated
diffusion.
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[1]
[Total: 10 marks]
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2. (a) State the roles of glycoproteins, carrier proteins and
cholesterol in the cell surface membrane of an
animal cell.
glycoproteins
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carrier proteins
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cholesterol.......................................................................................................................................................
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[3]
(b) Fig. 2.1 is a diagram of an animal cell showing the
concentrations and direction of movement of an
ion (A) and a non-polar molecule (B) on either side of the cell
surface membrane.
Fig. 2.1
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With reference to Fig. 5.1, explain how A and B cross the cell
surface membrane of the cell.
A
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B
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[4]
(c) Describe how particles, such as bacteria, are taken up by
phagocytes.
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[2]
[Total: 9 marks]
3. Give an account of the ways in which molecules and ions move
into and out of cells.
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[Total: 10 marks]
4. Read through the following account of the transport of
molecules across a cell surface membrane, then
write on the dotted lines the most appropriate word or words to
complete the account.
Some molecules cross a cell surface membrane by passing down a
concentration gradient through the
phospholipid layer. This process is called
............................................................ Some
polar molecules
cross the membrane by combining with transport proteins which
can change their shape. When this
movement occurs down a concentration gradient, the process is
called ......................................................
and when it occurs against a concentration gradient the process
is called
.............................................. Most movement of
molecules against a concentration
gradient uses energy in the form of
.................................................................................
[Total: 4 marks]
5. (a) Molybdenum is a mineral ion found in the soil solution.
It enters the cell as molybdate ions, through
membrane transport proteins. The proteins have the ability to
bind to, and hydrolyse, ATP. Name and
describe the mechanism of transport of molybdate ions into the
cell.
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[3]
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(b) Describe three roles of the proteins in cell surface
membranes.
1
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2
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3
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[3]
(c) Glycoproteins are found in cell surface membranes. State one
function of these glycoproteins.
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[1]
[Total: 7 marks]
TOTAL MARKS FOR THIS PAPER: 50
THE END
PREPARED BY: MD. EMRUL HASAN, A LEVEL BIOLOGY TEACHER, SFX
GREENHERALD
