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1. Diagram shows the molecular structure of
food classes X, Y and Z.
Rajah menunjukkan struktur tiga kelas
makanan X, Y dan Z.
What is the food classes of X, Y and Z?
Apakah kelas makanan bagi X, Y dan Z?
X Y Z
A. Carbohydrate Karbohidrat
Protein Protin
Lipid Lipid
B. Protein Protin
Lipid Lipid
Carbohydrate Karbohidrat
C. Protein Protin
Carbohydrate Karbohidrat
Lipid Lipid
D. Lipid Lipid
Carbohydrate Karbohidrat
Protein Protin
2. Diagram shows the basic DNA structure.
Rajah menunjukkan struktur asas DNA.
What are P,R and S ?
Apakah P,R dan S ? Apakah fungsi X? P R S
A Nucleotide Nukleotida
Phosphate Fosfat
Deoxyribose sugar Gula deoksiribosa
B Phosphate Fosfat
Deoxyribose sugar Gula deoksiribosa
Nitrogenous base Bes bernitrogen
C Phosphate Fosfat
Nucleotide Nukleotida
Nitrogenous base Bes bernitrogen
D Nitrogenous base Bes bernitrogen
Phosphate Fosfat
Nucleotide Nukleotida
3. Rajah menunjukkan proses hidrolisis satu
molekul lemak.
Diagram shows the hydrolysis process of a
fat molecule.
Apakah W, X dan Y?
What are W, X and Y? W X Y
A. Laktase Lactase
Trigliserida Triglyceride
Asid lemak Fatty acid
B. Lipase Lipase
Asid lemak Fatty acid
Gliserol Glycerol
C. Protease Protease
Gliserol Glycerol
Trigliserida Triglyceride
D. Amilase Amylase
Trigliserida Triglyceride
Gliserol Glycerol
4. Which of the following is true about the
formation of a triglyceride molecule ?
Manakah antara berikut benar tentang
pembentukan molekul trigliserida ?
A. It consists of three molecules of
glycerol and one molecule of fatty acid
Ia terdiri tiga molekul gliserol dan satu
molekul asid lemak
B. It involves one molecule of glycerol
and three molecules of fatty acid
Ia melibatkan satu molekul gliserol dan
tiga molekul asid lemak
C. It involves three molecules of glycerol
and two molecules of fatty acids
Ia melibatkan tiga molekul gliserol dan
dua molekul asid lemak
D. It involves two molecules of glycerol
and three molecules of fatty acids
Ia melibatkan dua molekul gliserol dan
tiga molekul asid lemak
5. What is the process involved in breaking
down a dipeptide chain into amino acids?
Apakah proses yang terlibat dalam
pemecahan rantai dipeptida kepada asid
amino?
A. Condensation/ Kondensasi
B. Heating / Pemanasan
C. Acid addition / Penambahan asid
D. Hydrolysis / Hidrolisis
6. Diagram shows a type of molecular
structure of protein.
Rajah menunjukkan satu jenis struktur
molekul protein.
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What is the example of protein for this
structure?
Apakah contoh protein untuk struktur
tersebut?
A. Hormone / Hormon
B. Silk / Sutera
C. Hemoglobin / Hemoglobin
D. Antibody / Antibodi
7. Diagram shows the structure of protein
molecule.
Rajah menunjukkan struktur molekul
protein.
What is the type of the level of
organization of this protein?
Apakah aras organisasi protein ini?
A. Primary structure / Struktur primer
B. Secondary structure / Strukur
Sekunder
C. Tertiary structure / Struktur tertier
D. Quartenary structure / Struktur
kuarterner
8. Amylase is a protein. Which of the
following protein structure forms the
amylase?
Amilase adalah protein. Antara struktur
protein berikut, yang manakah
membentuk amilase?
9. Diagram shows a mechanism of enzymes
reaction.
Rajah menunjukkan satu mekanisma
tindak balas enzim.
Which statement can be deduced from
the diagram? Pernyataan yang manakah boleh
disimpulkan dari rajah itu?
A. Enzyme action is specific
Tindakan enzim adalah spesifik
B. Enzyme is destroyed at the end of the
reaction
Enzim dimusnahkan pada akhir tindak
balas
C. Enzyme reaction can be inhibited by
heavy metals
Tindakbalas enzim boleh direncat oleh
logam berat
D. Enzyme is denatured at 50 °C
Enzim dinyahasli pada suhu 50 °C
10. Diagram shows the action of an enzyme
maltase.
Rajah menunjukkan tindakan enzim
maltase.
X, Y and Z represent
X, Y dan Z mewakili
X Y Z
A. Maltose Glucose Fructose
B. Maltose Glucose Glucose
C. Maltose Glucose Galactose
D. Maltose Galactose Fructose
11. Diagram shows the structures of a
substrate and an enzyme.
Rajah menunjukkan struktur substrat dan
enzim.
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Which of the labelled parts A, B, C or D is
the active site?
Antara A, B, C dan D, yang manakah tapak
aktif ?
12. Diagram shows a bowl of marinated meat
with papaya leaves.
Rajah menunjukkan semangkuk daging
yang diperap bersama daun betik.
What is the purpose of using papaya
leaves?
Apakah tujuan menggunakan daun betik
tersebut?
A. To trap heat
Untuk memerangkap haba
B. To soften the meat
Untuk melembutkan daging
C. To digest the fat in the meat
Untuk mencernakan lemak di dalam
daging
D. To add flavour to the meat
Untuk menambah rasa pada daging
13. Diagram shows the optimum pH of
enzyme P in its reaction.
Rajah menunjukkan pH optimum bagi
enzim P dalam tindak balasnya.
What is enzyme P?
Apakah enzim P ?
A. Erepsin
B. Pepsin
C. Rennin
D. Trypsin
14. Diagram shows a graph obtained from a
chemical reaction catalysed by enzyme R
at pH 6.8.
Rajah menunjukkan graf yang diperolehi
daripada tindak balas kimia yang
dimangkinkan oleh enzim R pada pH 6.8.
What is enzyme R and the gland in human
body that secretes the enzyme?
Apakah enzim R dan kelenjar dalam
badan manusia yang merembes enzim
tersebut? Enzyme R
Enzim R Gland Kelenjar
A Pepsin Pepsin
Pancrease Pankreas
B Trypsin Tripsin
Duodenum Duodenum
C Amylase Amilase
Salivary gland Kelenjar Saliva
D Lipase Lipase
intestinal gland Kelenjar usus kecil
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PAPER 2 / KERTAS 2 (STRUCTURE)
1. Diagram 1.1 below shows the process of formation of a disaccharide molecule.
Rajah 1.1 menunjukkan suatu proses pembentukan molekul disakarida.
Diagram 1.1 / Rajah 1.1
(a)(i) Name
Namakan
Molecule P / Molekul P:...........................................................................................................
Process X / Proses X:................................................................................................................
Process Y / Proses Y: ...............................................................................................................
[3 marks/markah]
(ii) Explain why fructose is more appropriate taken as sweetener for diabetic
patients compared to P?
Jelaskan mengapa fruktosa adalah lebih sesuai di ambil sebagai gula penganti
bagi pesakit kecing manis berbanding P?
..................................................................................................................................................
..................................................................................................................................................
[2 marks/markah]
(b) Process Y occurs in the digestion system.
Explain the importance of process Y in the ruminant digestion system.
Process Y terlibat dalam sistem pencernaan.
Jelaskan kepentingan proses Y dalam sistem pencernaan haiwan ruminan.
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[1 markah]
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(c) Diagram 1.2 below shows the formation of polysaccharide.
Rajah 1.2 di bawah menunjukkan pembentukan polisakarida.
Diagram 2.2 / Rajah 2.2
(i) The process x can produce polymers called polysaccharide from hundreds of glucose
molecules. Give one example of the polysaccharide in plant and its importance.
Proses X boleh menghasilkan polimer yang disebut polisakarida daripada beratus molekul
glukosa .Berikan satu contoh polisarida yang terdapat dalam tumbuhan dan
kepentingannya.
Polysaccharide / Polisakarida:
..................................................................................................................................................
Importance / Kepentingan:
..................................................................................................................................................
[ 2 marks/ markah]
(ii) State two characteristics of polysaccharide in (c)(i)
Nyatakan dua ciri bagi polisakarida dalam (c)(i).
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..................................................................................................................................................
[2 marks/markah]
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2. Diagram 2.1 shows mechanism action of sucrase.
Rajah 2.1 menunjukkan mekanisme tindakan sukrase.
Diagram 2.1 / Rajah 2.1
(a)(i) Label X, Y and Z in Diagram 2.1
Label X, Y dan Z dalam Rajah 2.1 [2 marks/markah]
(ii) Complete the diagram in the box provided in Diagram 2.1 to complete the mechanism of
the enzyme reaction.
Lengkapkan rajah dalam kotak yang tersedia di Rajah 2.1 untuk melengkapkan mekanisme
tindakbalas enzim.Terangkan mengapa sebahagian otot kardiak pesakit sudah rosak.
[2 marks/markah]
(b) Based on Diagram 2.1, state two characteristic of enzyme.
Berdasarkan Rajah 2.1, nyatakan dua ciri enzim.
..................................................................................................................................................
..................................................................................................................................................
..................................................................................................................................................
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[2 marks/markah]
(c) The effect of different enzymes concentration on the rate of enzymatic reaction can be seen
on the graph in Diagram 2.2 .
Kesan kepekatan enzim yang berbeza ke atas tindak balas enzim dapat dilihat pada graf
dalam Rajah 2.2.
Diagram 2.2 / Rajah 2.2
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(i) Based on the graph in Diagram 2.2, explain the reaction of enzymes
Berdasarkan pada graf dalam Rajah 2.2, terangkan tindak balas enzim
..................................................................................................................................................
..................................................................................................................................................
..................................................................................................................................................
[3 marks/ markah]
(ii) If the concentration of enzyme increases, draw a line ( ) to show the enzyme
activity in Diagram 2.2
Jika kepekatan enzim bertambah, lukiskan satu garis () untuk menunjukkan aktiviti
enzim pada Rajah 2.2.
[1 marks/ markah]
(d) During Hari Raya, fermented glutinous rice is one of famous meal in our country. It is
produce by using food processing method that involves an enzyme. Name the enzyme and
explain how the enzyme act.
Semasa Hari Raya, antara menu yang terkenal di negeri kita ialah tapai pulut. Tapai pulut
dihasilkan menggunakan kaedah pemprosesan makanan melibatkan sejenis enzim.
Namakan enzim tersebut dan terangkan bagaimanakah ia bertindak
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..................................................................................................................................................
..................................................................................................................................................
[3 marks/ markah]
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SOALAN ESEI
1. Diagram shows two different structures of proteins X and Y.
Rajah menunjukkan dua struktur protein X dan Y yang berbeza.
(a) Using suitable example, explain the how the protein structure is formed.
Menggunakan contoh yang sesuai, terangkan bagaimana struktur protein itu terbentuk. [4 marks/4 markah]
(b) Diagram shows two boxes of detergent powder containing enzyme which are effective in
removing stains on clothes.
Rajah menunjukkan dua kotak serbuk pencuci yang mengandungi enzim yang berkesan
untuk menghilangkan kotoran pada pakaian
Suggest examples of specific enzymes other than enzymes used in the detergent powder
and how they are used in various fields in our daily life.
Cadangkan contoh enzim yang khusus selain daripada enzim yang digunakan dalam serbuk
pencuci dan bagaimana ia digunakan dalam pelbagai bidang dalam kehidupan seharian
kita.
[6 marks/6 markah]
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Answer scheme Paper 1
1. C 8. C
2. B 9. A
3. B 10. B
4. A 11. C
5. D 12. B
6. B 13. D
7. C 14. C
Paper 2
1(a)(i) P : Sucrose
X: Condensation
Y : Hydrolysis
(ii) P1: Fructose is a simple sugar (cannot be digested).
P2: P contains two of monosakaride
P3: will be hydrolysed into two molecules of simple
sugar
Any 2 P’s
(b) P1:( Help in) hydrolysis of Cellulose
P2: cellulose convert to glocose /smaller molecules
P3: glucose / small Molecules can be absorbed (by the
villus into the capillaries)
(c)(i)
(ii) P1: Does not taste sweet,
P2: not soluble in water
P3: do not crystalised
Any 2 P’s
2(a)(i) X : Sucrose
Y: Glucose // fructose
Z : Fructose // glucose
(ii)
(b)(i) P1 : Enzymes reaction is highly specific
P2 : Enzyme does not change at the end of reaction
P3 : Riversible in action
(Any two)
(c)(i) F : Increase of enzymes concentration will increase rate of
enzymatic reaction (until it reach a maximum point)
P1 : due to more active site is available to bind with a substrates
P2 : More substrates will bind at the active site of the enzymes to
form enzymes-substrate complex
P3 : produce more products
Any 3
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(c)(ii)
(d) P1: Zymase enzymes found in yeast.
P2: It acts on starch and convert it into glucose
P3: It acts on glucose and convert it into alcohol
P4: through fermentation process
(any two)
Paper 2 (Essay)
1(a) P1 : Structure X is tertiary protein
P2 : such as enzymes/hormones/antibodies/plasma proteins
P3 : formed when secondary structure folded into three dimensional shape P4 : Structure Y is quarternary protein
P5 : such as haemoglobin
P6 : formed from two or more tertiary structure that folded into a
large and complex molecule
Any 2 points each
(b) F1 : Protease/papain
P1 : to tenderize meat
F2 : lipase
P2 : ripening of the cheese
F3 : amylase/amyloglucosidase
P3 : convert starch into sugar in syrup making
F4 : zymase
P4 : convert glucose to ethanol in making alcoholic drinks
F5 : trypsin
P5 : remove in in leather products
F6 : cellulose
P6 : extract agar from seaweed
Any suitable answer
Any 6 points