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Section A
( 50 marks )
Answer all questions
1
Which of the following is the correct sequence of stages for mitosis?
A
Metaphase → telophase → anaphase → prophase
B
Anaphase → prophase → metaphase → telophase
C
Prophase → anaphase → metaphase → telophase
D
Prophase → metaphase → anaphase → telophase
2
Enzymes are highly specific in the reactions they catalyse. Which of the following
statements explains this characteristic of enzymes?
A
Protein molecules consist of helical structures.
B
Protein molecules consist of many amino acids.
C
Each enzyme molecule has a distinctive configuration.
D
Protein molecules are not destroyed by heat.
3
Which of the following is not the characteristic of mitosis?
A
Daughter cells are genetically different from parent cell and from each
other.
B
Damaged cells can be replaced by production of identical new cells.
C
New cells produced are used for growth of multicellular organisms.
D
The offsprings produced are identical to the parent.
4
Which of the following statements about lipids is false?
A
A wax is lipid.
B
Unsaturated fats are liquid at room temperature.
C
The body doesn’t need any cholesterol.
D
Both male and female sex hormones are steroids.
5
Which of the elements are present in carbohydrate ?
I
Carbon
II
Hydrogen
III
Nitrogen
IV
Oxygen
A
B
C
D
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I and III only
I, II and IV only
II, III and IV only
I, II, III and IV
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The DIAGRAM 1 below shows cell M and cell N. In which direction will water
move between cell M and cell N?
A
C
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DIAGRAM 1
N to M by simple diffusion
B
N to M by active transport
D
M to N by active transport
N to M by osmosis
The DIAGRAM 2 below shows a cell cycle.
DIAGRAM 2
What is the process occur during V?
A
Replication of DNA.
B
Replication of centrioles.
C
Chromosomes condense and become shorter and thicker.
D
High metabolic rate and synthesis of proteins and cellular organelles.
8
Which elements are found in nucleic acids?
A
B
C
D
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Carbon and hydrogen.
Carbon, hydrogen and oxygen.
Carbon, hydrogen, oxygen and nitrogen.
Carbon, hydrogen, oxygen, nitrogen and phosphorus.
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DIAGRAM 3 shows one of the four levels in protein structures
DIAGRAM 3
The level and example for such protein are
A
B
C
D
10
The DIAGRAM 4 below shows the condition of a plant cell after immersed in a
particular solution for 15 minutes.
A
B
C
D
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tertiary structure, enzymes.
tertiary structure, haemoglobin
quaternary structure, enzymes.
quaternary structure, haemoglobin.
DIAGRAM 4
Cell sap loses its mineral salts through osmosis.
It is flaccid.
The pressure of the cell increases.
It has a very high osmotic pressure.
Which of the following is not true about the differences between saturated fat
and unsaturated fat?
A
B
C
D
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Saturated fat
Solid at room temperature.
High cholesterol content.
No double bond present
between two carbon atoms.
Able to react with additional
hydrogen atom.
Unsaturated fat
Liquid at room temperature.
Low cholesterol content.
Double bond present between two
carbon atoms.
Unable to react with additional
hydrogen atom.
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The DIAGRAM 5 shows the structure of a nucleotide.
DIAGRAM 5
What are represented by the units labelled as X, Y and Z?
A
B
C
D
X
Phosphate group
Phosphate group
Sugar
Nitrogenous base
Y
Sugar
Nitrogenous base
Nitrogenous base
Phosphate group
Z
Nitrogenous base
Sugar
Phosphate group
Sugar
13
A bivalent is the name for
A
synapsis of a pair of homologous chromosomes.
B
a pair of sister chromatids.
C
a pair of non-homologous chromosomes.
D
one homologous chromosome.
14
Which one of the following nutrients, needed for the purpose of tissue growth and
repair, cannot be made by the human body?
A
Amino acids
B
Protein
C
Non-essential amino acids
D
Essential amino acids
15
The statement below show the use of a specific enzyme in industries and daily
lives.
• Tenderising meat
• Separating fish skin
• Extracting fur from animal skin
Based on the above information, which of the following enzymes is used?
A
Trypsin
B
Erepsin
C
Rennin
D
Protease
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The graph shows the effect of pH on the rate of reaction of enzyme X.
Enzyme X is
A
lactase.
C
trypsin.
B
D
salivary amylase.
rennin.
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Glucose
Process X
+
→
Y + Water
Galactose
What are represented by X and Y?
A
B
C
D
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X
Condensation
Condensation
Hydrolysis
Hydrolysis
Y
Maltose
Lactose
Lactose
Maltose
Which of the following diagrams is not true about a stage in mitosis?
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A
C
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B
D
The DIAGRAM 6 shows a graph of rate of reaction against substrate
concentration of an enzyme-controlled reaction by using 0.2% enzyme
concentration.
DIAGRAM 6
A
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B
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C
20
D
Groundnuts contain a nutrient which is broken down by lipase during
germination. Which test would detect this nutrient?
A
Benedict’s test
B
Translucent paper test
C
Iodine test
D
Burette Test
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The DIAGRAM 7 below shows diffusion through a semi-permeable membrane.
DIAGRAM 7
What are P and Q?
P
Distilled water
20% sucrose solution
20% sucrose solution
Distilled water
A
B
C
D
Q
Distilled water
20% sucrose solution
Distilled water
20% sucrose solution
22
Which enzyme, substrate and conditions are needed for the digestion of food in
the stomach?
Enzyme
Substrate
Conditions
A
amylase
starch
acid
B
amylase
starch
alkaline
C
protease
protein
acid
D
protease
protein
alkaline
23
The following information refers to organelle P.
•
•
Produces lipid
Transport of proteins to be used in the cell membrane
Identify organelle P.
A
Mitochondrion
C
Smooth endoplasmic reticulum
24
D
B
Nucleus
Golgi apparatus
Which of the following graphs represents the effect of pH on the rate of reaction
of enzyme secreted by the pancreas?
A
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B
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C
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D
If an animal cell is placed into a solution whose concentration of dissolved
substances is higher than that inside the cell,
A
the cell will swell.
B
the cell will shrivel.
C
the cell is described as plasmolysis.
D
the cell is described as deplasmolysis.
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Section B
( 30 marks )
Answer all questions
1
The DIAGRAM 8 below shows the model of a plasma membrane.
(a) (i)
(ii)
DIAGRAM 8
What name is given to the above plasma membrane model?
___________________________________________________________
[1 mark]
Give two characteristics of the model you mentioned in (a)(i).
1:__________________________________________________________
2:__________________________________________________________
[2 marks]
(b) Name the structures labelled P, Q, R and S.
P: _____________________________________________________________
Q: _____________________________________________________________
R: _____________________________________________________________
S: _____________________________________________________________
[4 marks]
(c) What is the main characteristic of structure labelled P?
_______________________________________________________________
_______________________________________________________________
[2 marks]
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(d) What is the function of structure Q in plasma membrane?
_______________________________________________________________
[1 mark]
2
The DIAGRAM 9 below shows a reaction catalysed by enzyme.
DIAGRAM 9
(a) Name the parts labelled S, T and U.
S: _____________________________________________________________
T: _____________________________________________________________
U: _____________________________________________________________
[3 marks]
(b) State two characteristics of T.
1: _____________________________________________________________
2: _____________________________________________________________
[2 marks]
(c) If T represents lipase, what is U?
_______________________________________________________________
_______________________________________________________________
[2 marks]
(d) State and explain the use of lipase in industry processes.
_______________________________________________________________
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_______________________________________________________________
_______________________________________________________________
[3 marks]
3
The DIAGRAM 10 shows a phase in cell division.
P
Q
R
DIAGRAM 10
(a) Name the parts labelled P, Q and R.
P:
___________________________________________________________
Q:
___________________________________________________________
R:
(b) (i)
___________________________________________________________
[3 marks]
Name the type of cell division.
(ii)
___________________________________________________________
[1 mark]
Name the phase shown above.
_____________________________________________________
[1 mark]
(c) Describe the process happen in P.
________________________________________________________________
________________________________________________________________
________________________________________________________________
[3 marks]
(d) Name two phases that happens after the phase shown above.
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1: _____________________________________________________________
2: _____________________________________________________________
[2 marks]
END OF QUESTION
SCHEME MARKS BIO F4 ASSESSMENT 2
SECTION A
QUESTION
1
2
3
4
5
6
7
8
9
10
11
12
13
TOPIC
5
4
5
4
4
3
5
3
3
3
4
4
5
TOPIC
3
4
5
ANWER
D
C
A
C
B
D
D
D
D
A
D
A
C
QUESTION
14
15
16
17
18
19
20
21
22
23
24
25
TOPIC
5
4
4
5
4
4
5
4
3
4
4
3
ANSWER
D
D
B
B
C
C
B
C
C
C
C
B
QUESTION
7
11
7
SECTION B
NO
1
ANSWER
(a) (i) Fluid mosaic model
MARK
[1 mark]
(ii) 1: Plasma membrane is comprised of the
phospholipid bilayer
2: Various types of protein molecules are
embedded in the plasma membrane
[1 mark]
[1 mark]
(b) P - Phospholipid bilayer
Q - Cholesterol
R - Carrier protein
S - Pore protein
[1 mark]
[1 mark]
[1 mark]
[1 mark]
(c) Contain phospholipid molecules that contain
[2 marks]
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hydrophilic head and hydrophobic tail.
[1 mark]
(d) Maintain the fluidity of plasma membrane
2
[1 mark]
[1 mark]
[1 mark]
(b) 1: Chemical reaction catalysed by T is a
reversible reaction.
2: It act specifically
[1 mark]
(c)
U is glycerol and fatty acid
[2 marks]
(d)
Manufacturing detergent - detergent with
added lipase can clean cloth with oil stain
effectively. Or any suitable answer
P - Chiasmata
Q - Homologous chromosomes
R – Centriole
[3 marks]
(b)
(i) Meiosis
(ii) Prophase I
[1 mark]
[1 mark]
(c)
3
(a) S: Substrate
T: Enzyme
U: Product
(The process of crossing over occur in P).
(During crossing over), (exchange of genetic [1 mark]
materials between two chromatid sisters
[1 mark]
takes place).
[1 mark]
(a)
(d) 1: Metaphase I
2: Anaphase I
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[1 mark]
[1 mark]
[1 mark]
[1 mark]
[1 mark]
[1 mark]
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