Self Learning Exercise

1
Self Learning Exercise
Q How does DNA control the metabolic
activities of the cells?
A. It controls the formation of proteins in the
cells.
B. It controls the chemical reactions in the
cells.
C. It regulates the metabolic activities of the
cells.
D. It controls the number of division of the
cells.
2
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3
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DNA cannot control the chemical reactions in the
cells directly.
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4
Sorry, youve got the wrong answer!!!
DNA cannot regulate the metabolic activities of
the cells directly.
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5
Sorry, youve got the wrong answer!!!
DNA cannot control the number of divisions of the
cells directly.
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6
Self Learning Exercise
Here are photomicrographs showing (1) some cells
of a human blood smear (2) some cells of an
onion epidermis
(1)
(2)
Q Which of the following is NOT a structural
difference between cells A and C?
A. C has cell wall but A does not.
B. C has small nucleus but A has large nucleus.
C. C has chloroplast but A does not.
D. C has vacuole but A does not.
7
Sorry, youve got the wrong answer!!!
C is a plant cell and therefore it has cell wall.
A is an animal cell and therefore it does not
have cell wall.
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8
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This is a true statement.
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9
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10
Sorry, youve got the wrong answer!!!
This is a true statement.
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11
Self Learning Exercise
Here are photomicrographs showing (1) some cells
of a human blood smear (2) some cells of an
onion epidermis
(1)
(2)
Q Why is the central part of cell B looks
lighter in colour?
A. There contains less nucleus to increase the
surface area to facilitate gases diffusion.
B. There contains less cytoplasm to increase the
surface area to facilitate gases diffusion.
C. There contains less haemoglobin to increase
the surface area for gases to dissolve in.
D. There is nothing in its central part as it a
ring- shaped cell.
12
Sorry, youve got the wrong answer!!!
Red blood cells do not contain nucleus.
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13
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14
Sorry, youve got the wrong answer!!!
Haemoglobin itself is for carrying gases (oxygen).
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15
Sorry, youve got the wrong answer!!!
Red blood cell is a biconcave disc, not
ring-shaped.
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16
Self Learning Exercise
Here are photomicrographs showing (1) some cells
of a human blood smear (2) some cells of an
onion epidermis
(1)
(2)
Q What is the function of cell A?
A. To kill germs by producing antibiotics.
B. To kill germs by engulfing them.
C. To expel germs out of body through urination.
D. To expel germs out of body through sweating.
17
Sorry, youve got the wrong answer!!!
Cell A is the white blood cell. Some of them can
kill germs by producing antibodies, not
antibiotics.
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18
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19
Sorry, youve got the wrong answer!!!
Cell A is the white blood cell, which cannot
expel germs out of human body.
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20
Sorry, youve got the wrong answer!!!
Cell A is the white blood cell, which cannot
expel germs out of human body.
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21
Self Learning Exercise
Here are photomicrographs showing (1) some cells
of a human blood smear (2) some cells of an
onion epidermis
(1)
(2)
Q What would happen to cell B if they were put
into a concentrated salt solution for half
an hour?
A. Cell B will remain the same.
B. Cell B will burst.
C. Cell B will be plasmolysed.
D. Cell B will shrink.
22
Sorry, youve got the wrong answer!!!
Osmosis is occurring between cell B and the salt
solution. Therefore, cell B cannot remain the
same.
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23
Sorry, youve got the wrong answer!!!
Cell B will burst only if it was put into a
dilute solution.
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24
Sorry, youve got the wrong answer!!!
Plasmolysis will occur only when a plant cell is
put into a concentrated solution due to the
presence of cell wall in plant cell.
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25
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26
Self Learning Exercise
Here are photomicrographs showing (1) some cells
of a human blood smear (2) some cells of an
onion epidermis
(1)
(2)
Q What would happen to cell C if they were put
into a hypertonic solution?
A. Cell B will remain the same.
B. Cell B will burst.
C. Cell B will be plasmolysed.
D. Cell B will shrink.
27
Sorry, youve got the wrong answer!!!
Osmosis is occurring between cell C and the
hypertonic solution. Therefore, cell B cannot
remain the same.
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28
Sorry, youve got the wrong answer!!!
Cell C will not burst even if it was put into a
dilute solution due to the presence of the cell
wall.
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29
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30
Sorry, youve got the wrong answer!!!
Cell C will not shrink due to the presence of the
cell wall.
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