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Question-1
Example of a typical homo-polysaccharide.
(A)
Insulin
(B)
Suberin
(C)
Lignin
(D)
Starch
Question-2
The graph shows the rate of an enzyme reaction at different levels of acidity or alkalinity (pH). From the graph, what is the optimum pH for this enzyme?
(A)
pH 2
(B)
pH 7
(C)
pH 10
(D)
pH 8
Question-3
Which of the following statements regarding enzyme inhibition is correct?
(A)
Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein
(B)
Non-competitive inhibitors often bind to the enzyme irreversibly
(C)
Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme
(D)
Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate
Question-4
Water has a high capacity for heat (thermal capacity). Which of the following may be the advantage in living cells due to this?
(A)
Any rise in temperature is small in comparison with the amount of heat absorbed by a cell
(B)
Any rise in temperature is large in comparison with the amount of heat absorbed by a cell
(C)
The 75% water in a cell does not retain a lot of heat
(D)
Any change in temperature will cause a cell to heat up or cool down quickly
Question-5
What will happen when a protein digesting enzyme is mixed with a starch solution?
(A)
Have no action
(B)
Produce glucose
(C)
Produce amino acids
(D)
Digest the starch
Question-6
Enzymes, vitamins and hormones can be classified into a single category of biological chemicals. Why?
(A)
Because all of these are exclusively synthesized in the body of a living organism as at present
(B)
Because all of these enhance oxidative metabolism
(C)
Because all of these are conjugated proteins
(D)
Because all of these help in regulating metabolism
Question-7
The catalytic efficiency of two different enzymes can be compared by the:
(A)
Molecular size of the enzyme
(B)
The pH optimum value
(C)
The Km value
(D)
Formation of the product
Question-8
The basic building block for all lipids.
(A)
Water
(B)
Acetyl-CoA
(C)
Phosphorus
(D)
Nucleic acid
Question-9
Assertion: Arachidic acid is an unsaturated fatty acid.
Reason: There are one or more double bonds between carbon atoms in unsaturated fatty acids.
(A)
Both Assertion and Reason are true and Reason is the correct explanation of the Assertion
(B)
Both Assertion and Reason are true but the Reason is not the correct explanation of Assertion
(C)
Assertion is true, but Reason is false
(D)
Both Assertion and Reason are false.
Question-10
A protein molecule which is denatured has :
(A)
Split into smaller molecules
(B)
Changed its shape
(C)
Combined with another molecule
(D)
Been diluted
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Cambridge Secondary Grade 9
IGCSE
Practice in Related Chapters
The Interdependence of Living Organisms
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Keeping Healthy
Transport in Plants
Classification
Cells and Tissues
Movement in and out of Cells
Personal Health
Animal Nutrition
Reproduction
Sensitivity
Cells the Building Blocks
Genetics
The Skeleton, Muscles and Movement
A Sexual Reproduction and Cloning Plants
The Senses
Survival
Co-ordination
Energy for Respiration
The Chemicals of Living Cells
How Substances Get In and Out of Cells
Plants for Food
Photosynthesis and Nutrition in Plants
Plant Structure and Function
Food and Diet
The Human Impact on the Environment
Digestion, Absorption and Use of Food
The Blood Circulatory System
Breathing
Excretion and the Kidneys
Human Reproduction
Classification
Conservation
Micro Organisms
Reproduction in Flowering Plants
Movement and Locomotion
Growth and Development
Disease: causes, transmission and control
Ecosystems
Population
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