Discovering Biology 1A – Chapter 2
Question bank
2010-2011 Al Biology quiz 1
1
2
3
4
5
Which of the following is the general formula of carbohydrates?
A.
CmH2mOm
B.
Cm(H2O)n
C.
(C6H10O5)n
D.
C6H12O6
The cell wall of a plant cell is made up of
A.
carbohydrates.
B.
lipids.
C.
minerals.
D.
proteins.
Which of the following substances is the food reserve found in most plant cells?
A.
glucose
B.
glycogen
C.
proteins
D.
starch
Starch is made up of
A.
glucose.
B.
glycerol and glucose.
C.
maltose and fructose.
D.
sucrose.
Which of the following statements about lipids is correct?
A.
Lipids cannot mix with water.
B.
Lipids are insoluble in alcohol.
C.
Lipids are soluble in water.
D.
Lipids are viscous in nature.
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QBCh02EE.doc
Discovering Biology 1A – Chapter 2
Question bank
6
7
8
9
QBCh02EE.doc
Lipid is formed from the combination of
A.
amino acids and glucose.
B.
amino acids and glycerol.
C.
fatty acids and glycerol.
D.
fatty acids and glycogen.
The positive result of grease spot test is the appearance of a permanent
A.
red spot.
B.
translucent spot.
C.
transparent spot.
D.
white spot.
Which of the following are the uses of lipids in mammals?
(1)
as a component of the cell membrane
(2)
as food reserves
(3)
as heat insulator
A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
Protein is made up of
A.
amino acids.
B.
fatty acids.
C.
minerals.
D.
glycerols.
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© Times Publishing (Hong Kong) Limited
Discovering Biology 1A – Chapter 2
10
Question bank
The table below shows the chemical composition of four molecules:
Carbon
Hydrogen
Oxygen
Nitrogen
Molecule P




Molecule Q




Molecule R




Molecule S




Key: ‘’ represents the presence of the element
‘’ represents the absence of the element
Which of the following molecules may be a protein molecule?
A.
P
B.
Q
C.
R
D.
S
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QBCh02EE.doc
Discovering Biology 1A – Chapter 2
Question bank
Short Questions
1
For each of the descriptions listed in column 1, select one term listed in column 2 that matches
with the description. Put the appropriate letter in the space provided.
Column 1
Column 2
(a) deposited around internal
_________
A carbohydrates
________
B lipids
organs in the bodies of mammals
(b) for growth and
repair of worn-out tissues
(c) in plants, its excess amount is ________
C proteins
mainly stored as starch
(d) a good solvent for the
________
D minerals
_________
E
transport of water-soluble
substances
(e) usually needed in small
water
amounts by organisms
(5 marks)
2
Lipids are organic substances that consist of carbon, hydrogen and oxygen. They are essential
for the survival of all living organisms.
Name another chemical constituent in food that is also composed of the elements carbon,
hydrogen and oxygen only.
QBCh02EE.doc
(1 mark)
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© Times Publishing (Hong Kong) Limited
Discovering Biology 1A – Chapter 2
3
Question bank
Two monosaccharides combine to form a disaccharide. This reaction is shown in the
following equation:
Glucose + A →
B (a non-reducing sugar) + X
(a)
Identify molecules A, B and X.
(3 marks)
(b)
Write down the chemical formula of molecule B.
(c)
What will happen if B is tested with Benedict’s solution? Why?
(d)
Suggest two ways for breaking down disaccharide into 2 monosaccharides.
(1 mark)
(2 marks)
(2 marks)
4
Draw a labelled diagram to show the structure of a triglyceride molecule.
5
The diagrams below show the structures of two amino acids, A and B. R1 and R2 are the side
(3 marks)
chains of A and B respectively:
(a)
What is X?
(1 mark)
(b)
Other than carbon, hydrogen and oxygen, state one element that may be present in R1
and R2.
(c)
(1 mark)
A and B can be linked together during protein synthesis. Name the chain formed when
many amino acids are joined together.
© Times Publishing (Hong Kong) Limited
- 24 -
(1 mark)
QBCh02EE.doc
Discovering Biology 1A – Chapter 2
Question bank
6
The flow chart below shows the sorting of a group of molecules,α:
(a)
Name element A.
(1 mark)
(b)
Identify molecules P, Q, R and S as the following substances:
(i)
glucose
(1 mark)
(ii)
cellulose
(1 mark)
(iii)
lipids
(1 mark)
(iv)
starch
(1 mark)
(c)
What is the use of the Benedict’s test?
(1 mark)
(d)
Suggest a test to verify molecule O.
(2 marks)
QBCh02EE.doc
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© Times Publishing (Hong Kong) Limited
Discovering Biology 1A – Chapter 2
Question bank
2010-2011 F6 Biology Quiz 1 Answers
1
B
The number of carbon atoms of a carbohydrate is not necessarily equal to that of oxygen atoms.
2
A
The cell wall of a plant cell is made up of cellulose. Cellulose is a carbohydrate.
3
D
Starch is the most common food reserve in plants though some monocotyledonous plants store
sugars.
4
A
Starch is made up of a long chain of glucose molecules.
5
A
Lipids are insoluble in water but are soluble in organic solvents. Some lipids are solid.
6
C
Three fatty acid molecules combine with a glycerol molecule to form a triglyceride molecule.
7
B
Lipids leave a translucent spot on a piece of filter paper.
8
D
All of them are the uses of lipids.
9
A
The basic unit of proteins is amino acids.
10
C
A protein molecule contains the following elements: carbon, hydrogen, oxygen, nitrogen and
sulphur.
Short Questions
1
2
(a)
B
[1 A]
(b)
C
[1 A]
(c)
A
[1 A]
(d)
E
[1 A]
(e)
D
[1 A]
carbohydrates
[1 A]
© Times Publishing (Hong Kong) Limited
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QBCh02EE.doc
Discovering Biology 1A – Chapter 2
Question bank
3
molecule A – fructose
[1 A]
molecule B – sucrose
[1 A]
molecule X – water
[1 A]
(b)
C12H22O11
[1 A]
(c)
Since B is a non-reducing sugar, a negative result will be obtained in the Benedict’s test.[1 A]
(a)
The Benedict’s solution remains blue in colour.
(d)
[1 A]
A disaccharide can be broken down into two monosaccharides with specific digestive enzymes
in the body.
[1 A]
It can also be done by heating a solution of disaccharide with a dilute acid in the laboratory.
[1 A]
4
5
6
-
Correct drawing
[2 A]
-
Correct labels (fatty acids, glycerol)
[1 A]
(a)
carboxyl group / -COOH
[1 A]
(b)
sulphur
[1 A]
(c)
polypeptide
[1 A]
(a)
nitrogen
[1 A]
(b)
(i)
molecule Q
[1 A]
(ii)
molecule S
[1 A]
(iii)
molecule R
[1 A]
(iv)
molecule P
[1 A]
(c)
To test for the presence of reducing sugars in a sample.
[1 A]
(d)
Test with Albustix paper.
[1 A]
The paper changes from yellow to green in the presence of protein.
[1 A]
QBCh02EE.doc
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© Times Publishing (Hong Kong) Limited
Discovering Biology 1A – Chapter 2
1
(CS1)
1
Question bank
Which of the following is the general formula of carbohydrates?
A.
CmH2mOm
B.
Cm(H2O)n
C.
(C6H10O5)n
D.
C6H12O6
B
The number of carbon atoms of a carbohydrate is not necessarily equal to that of oxygen
atoms.
2
(CS2)
2
The cell wall of a plant cell is made up of
A.
carbohydrates.
B.
lipids.
C.
minerals.
D.
proteins.
A
The cell wall of a plant cell is made up of cellulose. Cellulose is a carbohydrate.
3
(CS3)
3
Which of the following substances is the food reserve found in most plant cells?
A.
glucose
B.
glycogen
C.
proteins
D.
starch
D
Starch is the most common food reserve in plants though some monocotyledonous plants
store sugars.
© Times Publishing (Hong Kong) Limited
- 28 -
QBCh02EE.doc
Discovering Biology 1A – Chapter 2
Question bank
4
(CS4)
4
Starch is made up of
A.
glucose.
B.
glycerol and glucose.
C.
maltose and fructose.
D.
sucrose.
A
Starch is made up of a long chain of glucose molecules.
5
(CS5)
5
Which of the following statements about lipids is correct?
A.
Lipids cannot mix with water.
B.
Lipids are insoluble in alcohol.
C.
Lipids are soluble in water.
D.
Lipids are viscous in nature.
A
Lipids are insoluble in water but are soluble in organic solvents. Some lipids are solid.
6
(CS6)
6
Lipid is formed from the combination of
A.
amino acids and glucose.
B.
amino acids and glycerol.
C.
fatty acids and glycerol.
D.
fatty acids and glycogen.
C
Three fatty acid molecules combine with a glycerol molecule to form a triglyceride
molecule.
QBCh02EE.doc
- 29 -
© Times Publishing (Hong Kong) Limited
Discovering Biology 1A – Chapter 2
7
(CS7)
7
Question bank
The positive result of grease spot test is the appearance of a permanent
A.
red spot.
B.
translucent spot.
C.
transparent spot.
D.
white spot.
B
Lipids leave a translucent spot on a piece of filter paper.
8
(CS8)
8
Which of the following are the uses of lipids in mammals?
(1)
as a component of the cell membrane
(2)
as food reserves
(3)
as heat insulator
A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
D
All of them are the uses of lipids.
9
(CS9)
9
Protein is made up of
A.
amino acids.
B.
fatty acids.
C.
minerals.
D.
glycerols.
A
The basic unit of proteins is amino acids.
© Times Publishing (Hong Kong) Limited
- 30 -
QBCh02EE.doc
Discovering Biology 1A – Chapter 2
Question bank
10
The table below shows the chemical composition of four molecules:
(CS10)
Carbon
Hydrogen
Oxygen
Nitrogen
Molecule P




Molecule Q




Molecule R




Molecule S




Key: ‘’ represents the presence of the element
‘’ represents the absence of the element
Which of the following molecules may be a protein molecule?
10
A.
P
B.
Q
C.
R
D.
S
C
A protein molecule contains the following elements: carbon, hydrogen, oxygen, nitrogen
and sulphur.
QBCh02EE.doc
- 31 -
© Times Publishing (Hong Kong) Limited
Discovering Biology 1A – Chapter 2
Question bank
Short Questions
2
For each of the descriptions listed in column 1, select one term listed in column 2 that matches
(CS2)
with the description. Put the appropriate letter in the space provided.
Column 1
Column 2
(a) deposited around internal
_________
A carbohydrates
________
B lipids
organs in the bodies of mammals
(b) for growth and
repair of worn-out tissues
(c) in plants, its excess amount is ________
C proteins
mainly stored as starch
(d) a good solvent for the
________
D minerals
_________
E
transport of water-soluble
substances
(e) usually needed in small
water
amounts by organisms
(5 marks)
(a)
B
[1 A]
(b)
C
[1 A]
(c)
A
[1 A]
(d)
E
[1 A]
(e)
D
[1 A]
© Times Publishing (Hong Kong) Limited
- 32 -
QBCh02EE.doc
Discovering Biology 1A – Chapter 2
Question bank
3
(CS3)
Lipids are organic substances that consist of carbon, hydrogen and oxygen. They are essential
for the survival of all living organisms.
Name another chemical constituent in food that is also composed of the elements carbon,
hydrogen and oxygen only.
(1 mark)
carbohydrates
1
(CS1)
[1 A]
Two monosaccharides combine to form a disaccharide. This reaction is shown in the
following equation:
Glucose + A →
B (a non-reducing sugar) + X
(a)
Identify molecules A, B and X.
(3 marks)
(b)
Write down the chemical formula of molecule B.
(c)
What will happen if B is tested with Benedict’s solution? Why?
(d)
Suggest two ways for breaking down disaccharide into 2 monosaccharides.
(1 mark)
(2 marks)
(2 marks)
molecule A – fructose
[1 A]
molecule B – sucrose
[1 A]
molecule X – water
[1 A]
(b)
C12H22O11
[1 A]
(c)
Since B is a non-reducing sugar, a negative result will be obtained in the Benedict’s
(a)
(d)
test.
[1 A]
The Benedict’s solution remains blue in colour.
[1 A]
A disaccharide can be broken down into two monosaccharides with specific digestive
enzymes in the body.
[1 A]
It can also be done by heating a solution of disaccharide with a dilute acid in the
laboratory.
QBCh02EE.doc
[1 A]
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© Times Publishing (Hong Kong) Limited
Discovering Biology 1A – Chapter 2
3
Question bank
Draw a labelled diagram to show the structure of a triglyceride molecule.
(3 marks)
(CS3)
4
(CS4)
-
Correct drawing
[2 A]
-
Correct labels (fatty acids, glycerol)
[1 A]
The diagrams below show the structures of two amino acids, A and B. R1 and R2 are the side
chains of A and B respectively:
(a)
What is X?
(1 mark)
(b)
Other than carbon, hydrogen and oxygen, state one element that may be present in R1
and R2.
(c)
(1 mark)
A and B can be linked together during protein synthesis. Name the chain formed when
many amino acids are joined together.
© Times Publishing (Hong Kong) Limited
- 34 -
(1 mark)
QBCh02EE.doc
Discovering Biology 1A – Chapter 2
Question bank
(a)
carboxyl group / -COOH
[1 A]
(b)
sulphur
[1 A]
(c)
polypeptide
[1 A]
QBCh02EE.doc
- 35 -
© Times Publishing (Hong Kong) Limited
Discovering Biology 1A – Chapter 2
5
(CS5)
Question bank
The flow chart below shows the sorting of a group of molecules,α:
(a)
Name element A.
(1 mark)
(b)
Identify molecules P, Q, R and S as the following substances:
(i)
glucose
(1 mark)
(ii)
cellulose
(1 mark)
(iii)
lipids
(1 mark)
(iv)
starch
(1 mark)
(c)
What is the use of the Benedict’s test?
(1 mark)
(d)
Suggest a test to verify molecule O.
(2 marks)
© Times Publishing (Hong Kong) Limited
- 36 -
QBCh02EE.doc
Discovering Biology 1A – Chapter 2
Question bank
(a)
nitrogen
[1 A]
(b)
(i)
molecule Q
[1 A]
(ii)
molecule S
[1 A]
(iii)
molecule R
[1 A]
(iv)
molecule P
[1 A]
(c)
To test for the presence of reducing sugars in a sample.
[1 A]
(d)
Test with Albustix paper.
[1 A]
The paper changes from yellow to green in the presence of protein.
[1 A]
QBCh02EE.doc
- 37 -
© Times Publishing (Hong Kong) Limited