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INTERACTIVE
MULTIPLE CHOICE
QUESTIONS
The answers are provided, but so also are
explanations of why the alternatives are
unsatisfactory
D.G. Mackean
Principles of Biology
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These multiple choice questions are similar to the ones set
by the GCSE and IGCSE Examination Boards except that,in some cases, there may be more than one acceptable
answer.
For this reason, even if you select a correct answer at your
first attempt, it is worth looking at all the alternatives
(a) to see if there is a better answer and
(b) to see why some of the alternatives are unacceptable.
Question 1
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Question 1
The drawings represent stages in division
of an animal cell. a
b
c
d
(a) b, d, a, c
(b) b, d, c, a
(c)b, a, c, d
(d) b, c, d, a
Question 2
Which of the following is the correct
sequence of events?
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Yes
This the correct sequence
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The cell constricts (a) before the cells separate (c)
No
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The nucleus divides (d) before the cell starts to
constrict (a)
No
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The separation into two cells is the final stage
No
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Question 2
The drawing represents a typical leaf cellfrom a plant. What structure or structures
are missing from the drawing?
(a) cell wall
(b) cytoplasm
(c) nucleus
(d) chloroplasts
Question 3
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cell wall
No
The cell wall is present
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cytoplasm
No
The cytoplasm is present
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Yes
nucleus
The nucleus was omitted
from the drawing
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No
The chloroplasts are present
chloroplasts
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Question 3
After being exposed to temperatures ranging from 50-60C,
most enzyme cannot function because
(a) their molecules have been broken down
(b) their molecules have changed shape
(c) their composition has been changed
(d) they cannot separate from their substrate
Question 4
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The molecules remain intact at these temperatures
No
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The molecules have been denatured. That is, their shape
has changed so that they can no longer bind to their
substrate
Yes
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The composition of the enzyme molecule is usually
unaltered at these temperatures
No
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They are unable to combine with their substrate
No
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Question 4
Which of these statements is correct?
The enzyme amylase
(a) breaks down starch and protein
(b) works best at 50C
(c) breaks down starch only
(d) breaks down cellulose
Question 5
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No
Enzymes act on only one type of substrate
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No
Most enzymes are denatured (inactivated) at this
temperature
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Yes
Amylase acts on starch, breaking it down to maltose
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No
The enzyme which breaks down cellulose would
be a cellulase
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Question 5
In biology, the term respiration means
(d) A procedure used to revive a person
who has stopped breathing
(c) releasing energy from carbohydrates by
combing them with oxygen
(b) the release of energy from food substances
(a) the act of breathing
Question 6
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No
The act of breathing is called ventilation. It is a method
of obtaining oxygen for aerobic respiration
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Yes
The release of energy from the breakdown of food
substances, such as glucose, is called respiration
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Partly right
But this definition applies only to aerobic respiration.
Energy can also be released from food by anaerobic
respiration for which oxygen is not needed.
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No
Reviving a person who has stopped breathing is
called resuscitation. In First Aid this is done by the
mouth to mouth method. An outdated method,
depending on compression of the thorax was called
(misleadingly) artificial respiration
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Question 6
Which of the following is NOT reliable evidence of
respiration in a land-dwelling organism
(d) Loss of dry mass
(c) Uptake of oxygen
(b) Production of water vapour
(a) Output of carbon dioxide
Question 7
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This is reliable evidence
The equation for aerobic respiration
C6H12O6 + 6O2 6CO2 + 6H2O
shows that production of carbon dioxide is goodevidence of respiration
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Although the equation for aerobic respiration
C6H12O6 + 6O2 6CO2 + 6H2O
shows that water is a product of respiration it
is not good evidence of respiration because
non-living material can produce water vapour
by evaporation alone
This is not reliable evidence
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The equation for aerobic respiration
C6H12O6 + 6O2 6CO2 + 6H20
shows that uptake of oxygen is goodevidence of respiration.
Admittedly, anaerobic respiration does not
consume oxygen but it seems unlikely that a
land dwelling organism would be usinganaerobic respiration exclusively
This is reliable evidence
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This isreliable evidence
Although the equation
C6H12O6 + 6O2 6CO2 + 6H20
shows glucose as the respiration substrate, almost any
tissues can be used for respiration so a loss in dry
mass means respiration is occurring. It has to be dry
mass to avoid the loss of mass associated with
evaporation
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Question 7
In a green plant, when the rates of respiration andphotosynthesis are equal the plant will be .
(a) taking in carbon dioxide
(d) giving out water vapour
(b) giving out oxygen
(c) taking in carbon dioxide and giving out oxygen
Question 8
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No
The carbon dioxide needed for photosynthesis will
all come from respiration
6CO2 + 6H2O C6H12O6 + 6O2 (photosynthesis)
C6H12O6 + 6O2 6CO2 + 6H2O (respiration)
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No
All the oxygen produced by photosynthesis will be
used for respiration
6CO2 + 6H2O C6H12O6 + 6O2 (photosynthesis)
C6H12O6 + 6O2 6CO2 + 6H2O (respiration)
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No
There will be no net uptake of carbon dioxide or output of
oxygen. All the carbon dioxide needed for photosynthesis
will come from respiration, and the oxygen produced by
photosynthesis will be used in respiration
6CO2 + 6H2O C6H12O6 + 6O2 (photosynthesis)
C6H12O6 + 6O2 6CO2 + 6H2O (respiration)
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There will be no net uptake of carbon dioxide or output
of oxygen. All the carbon dioxide needed for
photosynthesis will come from respiration, and the
oxygen produced by photosynthesis will be used inrespiration. (See previous slide).
However, the plant will be transpiring and there will be a
loss of water vapour
Yes
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Question 8
Which of thestructures in these
palisade cells from
a leaf is responsible
for photosynthesis?
1
2
3
4
(d) 4
(c) 3
(b) 2
(a) 1
Question 9
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Yes
This structure is a chloroplastand is the site of
photosynthesis
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No
This structure is the nucleus. It controls the activities in
the cell but does not photosynthesize
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No
This is the vacuole. It may store sugars produced in
photosynthesis but it does not photosynthesize
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No
This is the cytoplasm. Most of the chemical
processes of the cell occur in the cytoplasm, but not
photosynthesis
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Question 9
Which of the following mineral ions does a plant need
for making proteins?
(a) Phosphate ions
(b) Potassium ions
(c) Nitrate ions
(d) Magnesium ions
Question 10
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No
Phosphate ions are needed for making DNA and for
many enzyme reactions, but do not form part of
proteins
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No
Potassium ions are needed for certain reactions in
the plant cell, including those leading to root
formation, but they do not form part of a protein
molecule
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Yes
Nitrate ions are combined with the carbohydrate
molecules produced during photosynthesis, and form
amino acids and proteins
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No
Magnesium ions are needed for forming chlorophyll but
not for forming proteins
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Question 10
Diffusion of oxygen in air takes place as a result of
(a) convection currents
(b) air movements
(d) changes in temperature
(c) random movement of molecules
Question 11
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No
Convection currents would move the air as a
whole. It would not specifically affect any one
gas in the air
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No
Air movements would affect all atmospheric gases in the
same way
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Yes
Small random movements of oxygen molecules
results in their moving, eventually, from a place where
the molecules are more abundant to places where they
are scarcer, until they are evenly distributed
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No
Changes in temperature affect all the atmospheric
gases. A rise in temperature may speed up diffusion but
not specifically of oxygen
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Question 11
In osmosis, water will diffuse through a partially
permeable membrane
(a) from water to a concentrated solution
(b) from a concentrated to a dilute solution
(c) from a dilute solution to a concentrated solution
(d) from a dilute solution to a more dilute solution
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Yes
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No
The water movement in osmosis is from the dilute
solution to the concentrated solution
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Yes
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No
In osmosis the diffusion of water between solutions is
always from the more dilute solution to the less dilute
(i.e. more concentrated) solution
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