Page 83 - Biology_F5

Biology for Advanced Level Secondary Schools
Revision exercise 1
1. Why is a mitochondrion said to be a
cell within a cell?
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2. Explain the prokaryotic nature of
the mitochondrion and chloroplast.
3. Chloroplasts, mitochondria, and
bacteria have features in common.
Substantiate.
4. Explain the role of the following
cell organelles:
(a) Lysosomes
(b) Endoplasmic reticulum
(c) Ribosome
(d) Golgi apparatus
5. With the aid of diagrams,
differentiate a bacterial cell from a
plant cell.
6. What are the similarities and
differences between the structure of
centrioles and that of flagella?
7. Describe the difference in molecular
structure between cellulose and
starch.
8. Explain why amylase, the enzyme
that catalyses the hydrolysis of
starch, cannot catalyse the hydrolysis
of cellulose.
9. Compare the lock-and-key
hypothesis and the induced fit
hypothesis of enzymatic action.
10. A group of Form V students
conducted a food biochemical
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test using Biuret's solution, where
2ml of food sample paste was
placed in a clean and dry test tube.
Subsequently, 2 ml of Sodium
hydroxide solution was added to a
test tube and well mixed. Thereafter,
two drops of Copper (II) sulphate
solution were added to the test tube.
After shaking, the test tube was
allowed to stand for a few minutes
until a purple color was developed.
(a) Which kind of food nutrients
were present in a food sample?
(b) What was the role of Copper (II)
Sulphate in this biochemical
food test?
11. An ATP plays a central role in
cellular metabolism by providing
energy necessary for various
biochemical reactions and cellular
processes. Outline the uses of ATP
in different metabolic activities of
cells.
12. The function of a protein is closely
tied to its three-dimensional
structure. Briefly describe five types
of bonds, which hold a specific
structure of a protein molecule.
13. Activation energy is the minimum
amount of energy that must be
available to the reactants for a
chemical reaction to occur. With
illustration, differentiate enzyme-
catalysed reaction and non-catalysed
reaction.
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