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Question-1
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-2
The basic building block for all lipids.
(A)
Water
(B)
Acetyl-CoA
(C)
Phosphorus
(D)
Nucleic acid
Question-3
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-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
The largest biomolecule in a living cell.
(A)
Glycogen
(B)
Protein
(C)
Cholesterol
(D)
Deoxyribonucleic acid
Question-6
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-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
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-9
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-10
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
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Cambridge Secondary Grade 9
IGCSE
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