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Question-1
Which one of the following is wrong statement?
(A)
Anabaena and Nostoc are capable of fixing nitrogen in free-living state also.
(B)
Nitrosomonas and Nitrobacter are chemoautotrophs.
(C)
Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins.
(D)
Root nodule forming nitrogen fixers live as aerobes under free-living conditions.
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
Example of a typical homo-polysaccharide.
(A)
Insulin
(B)
Suberin
(C)
Lignin
(D)
Starch
Question-4
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-5
Assertion: A coenzyme or metal ion that is very tightly bound to enzyme protein is called prosthetic group.
Reason: A complete, catalytically active enzyme together with its bound prosthetic group is called apoenzyme.
(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 explanations of Assertion
(C)
Assertion is true, but Reason is false
(D)
Both Assertion and Reason are false
Question-6
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-7
A protein molecule which is denatured has :
(A)
Split into smaller molecules
(B)
Changed its shape
(C)
Combined with another molecule
(D)
Been diluted
Question-8
The largest biomolecule in a living cell.
(A)
Glycogen
(B)
Protein
(C)
Cholesterol
(D)
Deoxyribonucleic 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
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
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Cambridge Secondary Grade 9
IGCSE
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