section b&c
TRANSCRIPT
SULIT 4551
SECTION B1. Diagram 1.1 shows human’s cheek cell observed through an electron microscope.
Diagram 1.1
(a) (i) Name the structure labeled P and Q .
P : ………………………………………………………………………………….
Q : …………………………………………………………………………………
[2 marks]
(ii) P and Q involve in the process of enzyme synthesis. State the roles of P and Q
in this process.
P-…………………………………………………………………………………………….
…………………………………………………………………………………………….
Q-……………………………………………………………………………………………
…………………………………………………………………………………………….
[2 marks]
(b) (i) Cheek cell and onion epidermal cells are observed under light microscope.
Draw a labeled diagram of an onion epidermal cell observed under the light
microscope.
[2 marks]
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(ii) State two differences in structure between a cheek cell and an onion epidermal
cell that is observed under the microscope.
…………………………………………………………………………………………….
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[2 mark]
(c) If structure R is removed from a cell. Explain what would happen to the growth of
the cell.
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[2 marks]
(d) Explain why meristematic cells have more organelle S compared to cheek cells.
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[2 marks]
2. Diagram 2.1 shows the organelles in an animal cell that involved in the synthesis and secretion of protein P molecule.
Diagram 2.1
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(a) Name organelles labelled W, Y and Z.
W:............................................................................
Y:............................................................................
Z:............................................................................
[3 marks]
(b) State the function of Y .
................................................................................................................................
[1 mark]
(c) Explain why organel W is found abundantly in the cell.
..............................................................................................................................................
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[2 marks]
(d) Molecule P is the protein that is produced and is secreted by the cell.
(i) What is the type of protein structure shown by the P molecule?
......................................................................................................................................
(ii) Give one example of the P protein structure mentioned in d(i).
....................................................................................................................................
[2 marks]
(e) Diagram 2.2 and 2.3 show a dirty shirt with oily stain and detergent brand SSS that
being used in the washing .
Diagram 2.2 Diagram 2.3
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Puan Maria uses tap water to wash the dirty clothes with SSS detergent washing
powder but the cleaning is less effective.
Based on the information above,
( i ) Suggest one way to make the washing more effective.
……………………………………………………………………....................…..………………
[1 mark]
( ii ) Explain how the answer in (e) ( i ) affect the rate of bioenzyme Y reaction.
……………………………………………………………………..........…………….……
……………………………………………………………...................................................
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[2 marks]
(iii) Give one example of bioenzyme Y that has been added into the detergent in order to
remove the oil stain.
…………………………………………………………………………………..............................
[1 mark]
3. Diagram 3.1 shows a reaction catalysed by sucrase.
Diagram 3.1
(a) (i) Name the parts labelled P, R and S in Diagram 3.1.
P-……………………………………………………………………………….
R-……………………………………………………………………………….
S-………………………………………………………………………………..
[2 marks]
(ii) State two characteristics of R based on Diagram 3.1.
1. …………………………………………………………………………….
2. …………………………………………………………………………….
[2 marks]
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(b) (i) State the principle of enzyme reaction as shown in diagram 3.1
……………………………………………………………………………..
[1 mark]
(ii) Describe the mechanism of enzyme reaction based on Diagram 3.1
………………………………………………………………………………………
……………………………………………………………………….......................
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[2 marks]
(c) The temperature which sucrase reaction take place is increased to more 60°C. State the effect on the quantity of the product. Explain your answer.……………………………………………………………………..........…………….
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[2 marks]
4. Diagram 4.1 shows two sucrose solutions with different concentrations separated by semi permeable membrane.
Diagram 4.1
(a) Give a brief explanation of the process that will occur in the U-tube.
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[4 marks]
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(b) Based on the concept of movement of substances across the plasma
membrane, explain the following situations:
-The exchange of gases in alveolus and blood capillaries.
………………………………………………………………………………..
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[4 marks]
5. Diagram 5.1 shows a somatic cell in an organism.
Diagram 5.1(a) (i) Name structures Q, R,S and T in diagram 5.1
[2 marks](ii) State the function of Q and R.
Q-……………………………………………………………………………..
R-……………………………………………………………………………..
[2 mark]
(b) Name the substance that makes up R.
……………………………………………………………………………..[1 mark]
(c) The somatic cell in diagram 5.1 undergoes cell division as shown in Diagram 5.2.
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State the behaviour of chromosomes in the space provided.
………………………………………………………………………………
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[2 marks]
(d) (i) A duration of a normal cell cycle in a somatic cell is 12 hours. After the cell
undergone complete cell division after two days how many daughter cells are
produced?
............................................................................................................................
[1 mark]
(ii) If the somatic cell has 24 chromosomes, how many chromosomes are
contained in each of the daughter cells produced?
…………………………..……………………………………………………………
[1 mark]
(e) Leukemia is a type of blood cancer which is caused by uncontrolled mitosis.
Describe how cancer cell is formed.
............................................................................................................................
…........................................................................................................................
…........................................................................................................................[3 marks]
SECTION C
1. A semipermeable membrane is defined as a membrane that allows certain
molecules to diffuse through it but does not allow the diffusion of other molecules.
The diffusion of molecules through a semipermeable membrane depends on the size
of the molecules.
Based on the above information, plan a laboratory experiment to study the size of
molecules that can diffuse through a semipermeable membrane. The planning of
your experiment must include the following aspects:
Problem statement
Hypothesis
Variables
List of apparatus and materials
Experimental procedure
Presentation of data [17 marks]
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