Download Topic 3 MCQs revision

TOPIC 3 – MULTIPLE CHOICE QUESTIONS
1.
Identify the atoms and ions from the table below.
Atoms
Ions
A.
H+
Na+
OH–
Cl–
B.
Fe
K
CH3COO–
H2O
C.
Fe
H2O
Ca2+
N3 –
D.
Na
C
I–
NO3 –
(Total 1 mark)
2.
Which compounds are both organic and found in living organisms?
Glucose
C6H12O6
Carbon Dioxide
CO2
Urea
OC(NH2)
Calcium Carbonate
CaCO3
A.
B.
C.
D.
Key:
= present
= absent
(Total 1 mark)
3.
What causes water to have a relatively high boiling point?
A.
Hydrogen bonds between water molecules
B.
Hydrogen bonds between hydrogen and oxygen within water molecules
C.
Cohesion between water molecules and the container in which the water is boiled
D.
Covalent bonds between hydrogen and oxygen within water molecules
(Total 1 mark)
4.
Which of the following molecules is ribose?
A.
B.
C.
D.
(Total 1 mark)
1
5.
What is the maximum number of fatty acids that can be condensed with glycerol?
A.
One
B.
Two
C.
Three
D.
Four
(Total 1 mark)
6.
Which structure represents an amino acid?
A.
N
H
C.
C
O
N
C
OH
N
H
H
D.
H
H
H
C
H
H
H
B.
H
H
O
H
C
SH
H
N
H
C
OH
H
C
O
C
O
C
H
OH
(Total 1 mark)
7.
Which of the following reactions occurs when a dipeptide is formed from amino acids?
A.
Hydrolysis
B.
Denaturation
C.
Condensation
D.
Oxidation
(Total 1 mark)
2
8.
The graph below shows the effect of changing the substrate concentration on an enzyme controlled reaction.
40 % substrate
20 % substrate
10 % substrate
Amount of product formed
5 % substrate
2.5 % substrate
0 % substrate
Time
What is the correct interpretation of these data?
A.
The rate of reaction increases continuously with increase in substrate concentration.
B.
The rate of reaction decreases continuously with increase in substrate concentration.
C.
The rate of reaction increases up to a point and then remains constant.
D.
The rate of reaction is not affected by any change in the substrate concentration.
(1)
9.
What is an active site?
A.
The part of an enzyme that binds only to the product molecules.
B.
The sequence of amino acids responsible for the catalytic activity of enzymes.
C.
The sequence of amino acids responsible for the structure of an enzyme.
D.
The specific area responsible for the activity of all proteins.
(Total 1 mark)
10. In an electron micrograph, a DNA molecule appears 1 mm wide. The magnification of the micrograph is 500
000. What is the width of the DNA molecule?
A.
0.5 nm
B.
2 nm
C.
0.5 m
D.
2 m
(Total 1 mark)
11.
What is the composition of the backbone of DNA?
A.
Alternating sugar and phosphate molecules
B.
Complementary base pairs
C.
Alternating sugar and base molecules
D.
A polysaccharide|
(Total 1 mark)
3
12. The diagram below shows a short section of DNA molecule before and after replication. If the nucleotides
used to replicate the DNA were radioactive, which strands in the replicated molecules would be radioactive?
I
G C T A C
C G A T G
II
G C T A C
C G A T G
III
G C T A C
C G A T G
IV
A.
II and III only
B.
I and III only
C.
I and II only
D.
I, II, III and IV
(Total 1 mark)
13.
Which events take place in DNA replication?
I.
II.
III.
Formation of messenger RNA
Unwinding of DNA double helix
Formation of complementary strands by DNA polymerase
A.
I and II only
B.
I and III only
C.
II and III only
D.
I, II and III
(Total 1 mark)
14.
How would the following DNA sequence, ACGTTGCATGGCA, be transcribed?
A.
UGCAACGUACCGU
B.
TGCAACGTACCGT
C.
ACGTTGCATGGCA
D.
ACGUUGCAUGGCA
(Total 1 mark)
15. A certain gene in a bacterium codes for a polypeptide that is 120 amino acids long. How many nucleotides
are needed in the mRNA to code for this polypeptide?
A.
30
B.
40
C.
360
D.
480
(Total 1 mark)
4
16.
Where do transcription and translation occur in eukaryotic cells?
Transcription
Translation
A.
Cytoplasm
Cytoplasm
B.
Cytoplasm
Mitochondria
C.
Nucleus
Cytoplasm
D.
Nucleus
Nucleus
(1)
17. Of the following products, which is produced by both anaerobic respiration and aerobic respiration in
humans?
I.
Pyruvate
II.
ATP
III.
Lactate
A.
I only
B.
I and II only
C.
I, II and III
D.
II and III only
(Total 1 mark)
18.
What is the correct sequence of chemicals produced in the anaerobic respiration pathway?
A.
Lactate → pyruvate → ethanol
B.
Ethanol → pyruvate → glucose
C.
Glucose → lactate → pyruvate
D.
Glucose → pyruvate → lactate
(Total 1 mark)
19.
Pigments are extracted from the leaves of a green plant. White light is then passed through the solution of
pigments. What effect do the leaf pigments have on the white light?
A.
Green wavelengths are absorbed and red and blue wavelengths are transmitted.
B.
Red and blue wavelengths are absorbed and green wavelengths are transmitted.
C
Blue wavelengths are absorbed and green and red wavelengths are transmitted.
D.
Green and red wavelengths are absorbed and blue wavelengths are transmitted.
(1)
5
20.
In the diagram of a chloroplast below where will the Calvin cycle take place?
I
III
II
A.
I
B.
II
C.
III
D.
IV
IV
(Total 1 mark)
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