NEW
Font size
WorksheetsTEST 2
Total questions: 60
Worksheet time: 3600secs
Figure above shows the structure of enzyme N changed to structure R when being heat above 60oC through the process P . Name P?
hydrolysis
deamination
denaturation
condensation
The figure below which shows an illustration to describe the ‘lock and key’ hypothesis in the enzyme reaction. Which of the followings to represent P, Q and R?
P-Substrate, Q- Enzyme, R- Product
P-Product, Q- Substrate , R- Enzyme
P-Enzyme, Q- Product , R- Enzyme
P-Product, Q- Enzyme , R- Substrate
The figure below which shows an illustration to describe the ‘lock and key’ hypothesis in the enzyme reaction. Based on the figure above, which of the followings are not the properties of enzyme?
I. Enzyme is specific
II. Slow down the rates of chemical reaction
III. Enzyme catalyzed reactions are irreversible
IV. Remain unchanged at the end of the reaction
I and IV
II and III
I, II and III
II, III and IV
Choose the correct combination.
amylase digest starch into fructose
lipase digest oil into fatty acid and glycerol
lactase digest milk into maltose
pepsin digest fruits into amino acid
Which of the following are the properties of enzymes?
I. Specific III. Only small amount
II. Not destroyed IV. Not affected by changes in pH and temperature
I, II and III
I, II and IV
I, III and IV
II, III and IV
Diagram shows a graph which shows the relationship between the rate of reaction and the substrate concentration when factor Y is varied. What is factor Y ?
pH
Time
Inhibitor
Enzyme concentration
Which of the following can be deduced from diagram above ?
I. Enzyme reaction is specific
II. Enzyme reaction is reversible
III. Enzyme is not destroyed at the end of the reaction
IV. Optimum temperature for enzyme reaction is 40°C
I and II
I and III
II and IV
III and IV
Which of the following graphs represents the effect of pH on the rate of reaction by trypsin ?
The graph shows the effect of temperature on the activity of enzyme X.
Enzyme X is most active at
10°C to 20°C
20°C to 30°C
30°C to 40°C
40°C to 50°C
Figure shows the relationship between the rate of reaction and substrate concentration.
Which of the following statement is true?
When the concentration of substrate increase more product is produced because more substrate molecules are available to bind the active sites of the enzymes
The rate of reaction increases because there are less chances of collisions between the substrate molecules and the enzymes molecules
When the concentration increases, the speed of reaction also increases because less substrate binds the active of the enzymes
The rate of reaction is directly proportional the substrate concentrate continuously without limiting factor.
Figure shows the structures of a substrate and an enzyme.
Which of the labeled parts A, B, C or D is the active site ?
A
B
C
D
The diagram shows an experiment to study the action of pepsin on protein.
The contents of the test tube are mixture of 2 ml of albumen suspension which has been boiled and cooled, 1 ml of 1% pepsin solution and four drops of 0.1 M hydrochloric acid. The albumen suspension turns clear after 30 minutes.
Which step is able to reduce the time taken for the albumen suspension to turn clear ?
Reduce the temperature of water bath to 30°C
Increase the volume of 1% pepsin solution to 2 ml
Increase the volume of albumen suspension to 4 ml
Reduce the volume of 0.1 M hydrochloric acid to two drops.
Graph shows the effects of temperature on the rate of an enzyme- catalysed-reaction.
Which of the following statement is correct ?
When the temperature is low, the enzyme-catalyzed reaction is high.
When the temperature is high, the rate of reaction is not accelerated.
When the temperatures is optimum, the enzyme catalyses the reaction at the maximum rate.
When the temperatures is beyond the optimum, the enzyme catalyses the reaction is increase.
Which of the following is true about enzymes R and S ?
R- Secreted in the stomach
S-Secreted into the duodenum
R- The active site changes at pH more than 4
S- The active site changes at pH more than 7
R is trypsin
S is lipase
R- Synthesised in the rough endoplasmic reticulum
S- Synthesised in the smooth endoplasmic reticulum
The diagram shows a graph drawn after an experiment is carried out.
What happens at X ?
Enzymes are inactive
Enzymes are overworked
Enzymes begin to denature
Substrate concentration is too low
Diagram shows two shirts, P and Q that were stained with butter. The shirts were washed with washing powder that contains enzyme X at different temperatures.
What is enzyme X and the possible temperatures that were used for P and Q ?
Lipase. P- 10 °C. Q- 35 °C
Amylase. P- 10 °C. Q- 35 °C
Lipase. P- 35 °C. Q- 10 °C
Amylase. P- 35 °C. Q- 10 °C
Which of the following gives the correct use of enzyme in our daily life ?
Amylase- Removal of hair from hides
Lipase- Breakdown of starch
Ligninase - As a coagulant
Protease - Tenderise meat
G1, G2, M and S in the figure show the phases of a cell cycle in an organism.
Which of the following is the correct sequence of the interphase stage ?
Diagram below shows a cell cycle. Which of the phases labeled A, B, C and D does the replication of DNA occur ?
A
B
C
D
Figure below shows part of M phase in the cell wall cycle. This stage is known as
prophase
anaphase
metaphase
cytokinesis
Which of the following shows the correct sequence of the stages?
Which of the following is true about the product of the cell division in figure above?
Two daughter cells are produced, each containing 8 structures of P.
Four daughter cells are produced, each containing 4 structures of P.
Two daughter cells are produced, each containing 4 structures of P.
Four daughter cells are produced, each containing 8 structures of P.
Which of the following diagram is not true about a stage in mitosis ?
A cell with a single set of unpaired chromosomes is known as …
diploid
haploid
bivalent
homologous
Mitosis is important in
I. Biodiversity III. Asexual reproduction
II. Growth process IV. Repair and replacement of worn-out cells
I and III
II and IV
II, III and IV
I, II, III and IV
Name the process.
Chiasma
Synapsis
Replication
Crossing over
Diagram shows a diploid cell. This cell undergoes cell division through meiosis. Which of the following shows the stage where the number of chromosomes starts to reduce to half ?
This stage is called…
prophase I
prophase II
telophase I
telophase II
Diagram shows some of the stages in meiosis process taking place in a diploid cell, 2n = 4.
Which of the following is the correct sequence for the stage ?
I, II, III, IV
I, III, IV, II
I, IV, II, III
I, IV, III, II
A human ovum has 23 chromosomes. What is the chromosome number of a person’s check cells ?
23
46
86
92
The process of meiosis differs from the process of mitosis according to their number of …..
I. division occur III. chromosomes in the parent cell
II. daughter cell produced IV. chromosomes in the daughter cell
Q
I and II only
II and IV only
I, II and III only
I, II and IV only
The diploid chromosomal number of a cat is 38.
If one of the homologous chromosome pairs does not separate during Meiosis I, how many chromosomes can be found in the gametes ?
18
19
37
38
Which of the following are the genetic diseases ?
I. Cancer II. Tumour III. Down’s syndrome
I and II only
I and III only
II and III only
I, II, and III
Meiosis occurs in
I. anther II. stem III. ovary D. leaf
I and III
II and IV
I, II and III
I, II, III and IV
The figure below shows fertilization between the male and female gametes.
Which of the following shows the correct chromosome condition in X, Y and Z ?
X- haploid, Y- diploid, Z- diploid
X- diploid, Y- diploid, Z- diploid
X- diploid, Y- haploid, Z- haploid
X- haploid, Y- haploid, Z- diploid
Which statement is true about cloning?
A technique to alter and engineered genes to form new and beneficial traits.
The production of two daughter cells by the nuclear and cytoplasmic division
A technique or process of keeping tissues alive and growing in a culture medium
The production of one or more individuals which are genetically identical to one another
The anaerobic respiration in yeast that produces ethanol with the help of enzyme zymase is known as ________
Assimilation
Preservation
Fermentation
Pasteurization
The process which breakdown glucose in the presence of oxygen to release energy, carbon dioxide and water is known as ________
External respiration
Fermentation
Anaerobic respiration
Aerobic respiration
Which of the following product is released during anaerobic respiration in human muscles?
Ethanol
Lactic acid
Carbon dioxide
Water
What is the main substrate for respiration process?
lipid
glucose
amino acid
glycogen
Figure shows the tracheal system of an insect. Air enters the trachea through an opening labelled X. What is X.
Bronchiole
Air sac
Spiracle
Tracheole
- Occurs through the surface of moist and thin skin. The skin is thin and permeable for gaseous exchange
- The lungs consists of a pair of thin-walled sacs connected to the mouth
The above respiratory structural adaptation belongs to
Insect
Human
Fish
Amphibian
The process above occurs in the cell of an organism. Which of the following cells are mainly involved in the process?
Nerve cell
Red Blood Cell
Muscle cell
Liver cell
Figure shows the actions during a process in human breathing mechanism process. Name the process.
Inhalation
Exhalation
Diffusion
Active transport
Which of the following are the products of anaerobic respiration in yeast?
Lactic acid and water
Ethanol and carbon dioxide
Glucose and carbon dioxide
Lactic acid and carbon dioxide
Figure shows an experiment to investigate the process of X. During the experiment, the lime water turns cloudy. Name the process X.
Aerobic respiration
Anaerobic respiration
Digestion of starch
Assimilation
The figure above shows a model that is used to show a ribcage. Which of the following represented by P, Q, R and S?
P- rib, Q- sternum, R- intercostal muscle, S- vertebral column
P- rib, R- sternum, Q- intercostal muscle, S- vertebral column
Q- rib, P- sternum, R- intercostal muscle, S- vertebral column
R- rib, P- sternum, S- intercostal muscle, Q- vertebral column
Graph below shows the changes of pressure in the lungs of a person.
What is the movement of the ribcage at time X ?
Upwards and outwards
Upwards and inwards
Downwards and inwards
Downwards and outwards
Which structure is involved in the breathing mechanism of a frog ?
Rib cage
Diaphragm
Intercostal muscle
Bucco-pharyngeal cavity
Which of the following is the product of anaerobic respiration in human muscles and yeast ?
Ethanol
Heat energy
Lactic acid
Water
Diagram below shows structure X which is part of the respiratory structure of human.
Which of the following is true about structure X ?
I. It has one-cell thick walls
II. It is covered with a dense blood capillaries
III. It contains red pigments known as haemoglobin
IV. The partial pressure of carbon dioxide in X is high
I and II
I and III
II and III
III and IV
In the respiratory system of a fish, where does gaseous exchange occur ?
Gill raker
Gill arch
Filament
Mouth
Which of the following is the respiratory surface for both organisms?
Skin
Vacuole
Plasma membrane
Contactile vacuole
Which of the following are true about anaerobic respiration?
I During anaerobic respiration, only a small quantity of energy is release
II Organisms that respire anaerobically are known as anaerobes
III Anaerobic respiration occurs in cytoplasm
IV Oxygen is needed during anaerobic respiration
I, II and III
I, III and IV
II, III and IV
I, II, III and IV
How does fish maximize the efficiency of gaseous exchange ?
The closing of mouth and operculum
The opening of mouth and operculum
The same direction of water and blood flow through the gills
The opposite direction of water and blood flow through the gills
Which of the following occurs when a man runs a 100 metre race in 10s ?
I. Energy is released. III. Lactic acid is formed.
II. Glucose is used up. IV. An oxygen debt is built up.
I, II and III
I, II and IV
II, III and IV
I, II, III and IV
Which of the following take place when a man exhales ?
I. ribs lower III. lungs reduce in volume
II. diaphragm rises IV. air pressure in lungs increases
I, II and III
I, II and IV
II, III and IV
I, II, III and IV
Which of the following is the function of the epiglottis in the mammals ?
When vibrating it produces sound.
It pushes food downwards into oesophagus.
It prevents food particles entering the trachea.
It acts as a valve between the buccal and nasal cavities.
Diagram 7 shows an experiment on anaerobic respiration in yeast.
Which of the following are observed after 30 minutes?
X
Temperature in thermos-flask increases
Y
Lime water turns cloudy
Z
Gas bubbles are released
X and Y only
Y and Z only
X and Z only
X, Y and Z
Diagram 11 shows a model of the ribs to illustrate the breathing mechanism in humans.
What takes place as the position of the ribs changes from X to Y?
I Pressure in the lungs increases
II Volume of thoracic cavity decreases
III Rib cage pushes upwards and outwards
IV Inhalation takes place
I and II
only
I, III and IV only
Ill and IV only
I, II, III and IV
