topical practice - wickedbiology.files.wordpress.com · form 4 : chapter 4 ....

REZZUANA 0

TOPICAL PRACTICE FORM 4 : CHAPTER 4

HTTPS://WICKEDBIOLOGY.WORDPRESS.COM 1

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


Lipid Lipid

D. Lipid Lipid


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


D. Amilase Amylase


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.


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.


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


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.

..................................................................................................................................................

..................................................................................................................................................

..................................................................................................................................................

[1 markah]


(c) Diagram 1.2 below shows the formation of polysaccharide.

Rajah 1.2 di bawah menunjukkan pembentukan polisakarida.


(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).

..................................................................................................................................................

..................................................................................................................................................

[2 marks/markah]


2. Diagram 2.1 shows mechanism action of sucrase.

Rajah 2.1 menunjukkan mekanisme tindakan sukrase.


(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.

..................................................................................................................................................

..................................................................................................................................................

..................................................................................................................................................

..................................................................................................................................................

[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.



(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

..................................................................................................................................................

..................................................................................................................................................

..................................................................................................................................................

[3 marks/ markah]


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]


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


(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

topical practice - wickedbiology.files.wordpress.com · form 4 : chapter 4 ....

Documents