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Question-1
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-2
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-3
Which one of the following statement is NOT true?
(A)
Some inorganic elements are considered to be "essential" nutrients.
(B)
Triglycerides are considered to be "simple" lipids.
(C)
Virtually every reaction in a living cell requires an enzyme.
(D)
Only 10 "essential" amino acids are used in the synthesis of proteins.
Question-4
About 50% of the solid matter in a cell is normally composed of:
(A)
Nucleic acids
(B)
Protein
(C)
Carbohydrate
(D)
Lipid
Question-5
Which one of the following amino-acids was not found to be synthesized in Miller's experiment?
(A)
Glutamic acid
(B)
Aspartic acid
(C)
Glycine
(D)
Alanine
Question-6
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-7
The basic building block for all lipids.
(A)
Water
(B)
Acetyl-CoA
(C)
Phosphorus
(D)
Nucleic acid
Question-8
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-9
The largest biomolecule in a living cell.
(A)
Glycogen
(B)
Protein
(C)
Cholesterol
(D)
Deoxyribonucleic acid
Question-10
Carbohydrates, the most abundant biomolecules on earth, are produced by:
(A)
Fungi, algae and green plants cells
(B)
All bacteria, fungi and algae
(C)
Some bacteria, algae and green plant cells
(D)
Viruses, fungi and bacteria
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Cambridge Secondary Grade 9
IGCSE
Practice in Related Chapters
The Interdependence of Living Organisms
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Sensitivity
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Genetics
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A Sexual Reproduction and Cloning Plants
The Senses
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Energy for Respiration
The Chemicals of Living Cells
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Classification
Conservation
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Reproduction in Flowering Plants
Movement and Locomotion
Growth and Development
Disease: causes, transmission and control
Ecosystems
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