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- 1. Multiple Choice
Benedict's solution test for the presence of
reducing sugars, e.g. glucose
proteins
fats
starch
- 2. Multiple Choice
Biuret solution test for the presence of
reducing sugars, e.g. glucose
proteins
fats
starch
- 3. Multiple Choice
A sample of egg albumen (protein) solution was tested using the biuret test. Which one shows the result of the test and the deduction which can be made?
A
B
C
D
- 4. Multiple Choice
What shows that a solution contains protein?
A
B
C
D
- 5. Multiple Choice
Which food substance would produce a brick red precipitate when boiled with Benedict’s solution?
fat
protein
reducing sugar
starch
- 6. Multiple Choice
A food containing fats is tested with ethanol emulsion test. what would be the positive result?
remains clear
cloudy white emulsion forms
- 7. Multiple Choice
A food substance is tested with three reagents.
Iodine solution remains brown.
The biuret test gives a purple colour.
The ethanol test gives an emulsion.
Which nutrient(s) does the food substance contain?
A
B
C
D
- 8. Multiple Choice
The diagram shows cells from a storage organ of a plant.
The structures X are stained blue-black by iodine solution. (Hint: Plants photosynthesise to produce glucose. Excess glucose is stored as _____?)
What does X contain?
glycogen
starch
fat
amino acids
- 9. Multiple Choice
What is the basic unit to build proteins?
glucose
amino acids
fatty acids and glycerol
- 10. Multiple Choice
What is starch made from?
glucose
amino acids
fatty acids and glycerol
- 11. Multiple Choice
What are the basic units to make fats?
glucose
amino acids
fatty acids and glycerol
- 12. Multiple Choice
Starch (substrate) is digested to maltose (product) by the enzyme amylase.
According to the ‘lock and key’ hypothesis, which is the ‘key’ and which is the ‘lock’?
(Hint: SKII - substrate is the key, so enzyme must be the lock.)
A
B
C
D
- 13. Multiple Choice
Lipase digests fats (substrate) into fatty acids and glycerol (products).
According to the lock and key hypothesis, which is the lock and which is the key for the enzyme lipase?
Note: Fats are also called lipids.
A
B
C
D
- 14. Multiple Choice
The diagrams represent the activity of an enzyme.
What of the following is correct?
1 - enzyme
2 - active site
3 - substrate
4 - enzyme
- 15. Multiple Choice
Which of the following are proteins and increase the rate of biochemical reactions?
Enzymes
Genes
Hormones
Vitamins
- 16. Multiple Choice
What kind of molecule could be an enzyme?
fat
glucose
protein
starch
- 17. Multiple Choice
Which statement is true of all enzymes?
They are changed by the chemical reactions they speed up.
They are destroyed by temperatures above 40°C.
They are proteins.
They digest food in the alimentary canal.
- 18. Multiple Choice
Which statement is true for an enzyme?
It absorbs the sun's energy during photosynthesis.
It catalyses biological reactions.
It is destroyed by temperatures below 20 °C.
It slows down reactions in a cell.
- 19. Multiple Choice
The graph shows the effect of temperature on the digestion of starch.
At which temperature are starch molecules broken down most rapidly?
10 °C
30 °C
40 °C
50 °C
- 20. Multiple Choice
Activity of enzymes is affected by temperature and pH.
True
False
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