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- 1. Multiple Choice
What are the three most common elements in living organisms?
oxygen, hydrogen and nitrogen
nitrogen, carbon and phosphorus
oxygen, hydrogen and carbon
carbon, sulphur and nitrogen
- 2. Multiple Choice
Water is important to humans because
(1) it provides turgidity to maintain the body shape.
(2) it acts as a medium of transport in the human body.
(3) it helps maintain a relatively constant body temperature.
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
- 3. Multiple Choice
Which of the following descriptions about minerals is incorrect?
They are essential to the regulation of metabolism.
They are broken down during respiration to provide energy to organisms.
They are inorganic in nature.
They are transported by water in the human body.
- 4. Multiple Choice
Which of the following statements about glycogen is correct?
It is a storage form of carbohydrate in animals.
It is a component of plant cell walls.
It can form brick-red precipitate in Benedict’s test.
It is a polysaccharide found in both animals and plants.
- 5. Multiple Choice
Which of the following substances is the most soluble in water?
sucrose
cellulose
glucose
glycogen
- 6. Multiple Choice
What is the function of cholesterol in the human body?
as a component of cell membranes
protecting internal organs
as an insulating layer to reduce heat loss
as an energy reserve
- 7. Multiple Choice
Which of the following chemical substances can provide energy to the body?
(1) carbohydrates
(2) lipids
(3) minerals
(1) and (2) only
(2) and (3) only
(1) and (3) only
(1), (2) and (3)
- 8. Multiple Choice
The specificity of amino acids is determined by the
amino group.
side chain.
carboxyl group.
peptide bond formed between amino acids.
- 9. Multiple Choice
Which of the following is not the primary function of proteins?
as cell component
growth and tissue repair
form enzymes
energy storage
- 10. Multiple Choice
Which of the following comparisons about DNA and RNA is correct?
A
B
C
D
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