Transcript cell_self learning

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.
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DNA cannot control the chemical
reactions in the cells directly.
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DNA cannot regulate the metabolic
activities of the cells directly.
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DNA cannot control the number of
divisions of the cells directly.
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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.
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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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This is a true statement.
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Sorry, you’ve got the wrong answer!!!
This is a true statement.
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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 ringshaped cell.
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Red blood cells do not contain
nucleus.
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Haemoglobin itself is for carrying
gases (oxygen).
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Red blood cell is a biconcave disc,
not ring-shaped.
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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.
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Cell A is the white blood cell. Some
of them can kill germs by
producing antibodies, not
antibiotics.
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Cell A is the white blood cell, which
cannot expel germs out of human
body.
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Cell A is the white blood cell, which
cannot expel germs out of human
body.
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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.
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Osmosis is occurring between cell
B and the salt solution. Therefore,
cell B cannot remain the same.
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Cell B will burst only if it was put
into a dilute solution.
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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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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.
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Osmosis is occurring between cell
C and the hypertonic solution.
Therefore, cell B cannot remain the
same.
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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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Cell C will not shrink due to the
presence of the cell wall.
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