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9th Class Biology Chapter 6 Enzymes English Medium KPK Boards Online Mcqs MCQs With Answers
Question # 1
Trypsin works at the PH of:
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2
4
8
6
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Question # 2
Lock and key model was proposed by:
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Emil Fischer
Melcher
Koshland
Saugeo
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Question # 3
Beriberi can be produced by the lack of ......... .
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Vitamin A
Vitamin B
Vitamin BI
Vitamin C
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Question # 4
The first step in the cycle of an enzyme is;
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Substrate binds to enzyme
Substrate converted
Products released
Enzyme become free
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Question # 5
To waht category of molecules do enzymes belong?
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Carbohydrates
Lipids
Nucleic acids
Proteins
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Question # 6
Which one of the following convert lipids to fatty acids?
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Protease
Lipase
Both
None
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Question # 7
Catabolism constitutes ................. processes.
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Constructive
Destructive
Both a & b
None
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Question # 8
Which one of the following is specific in action ?
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Catalyst
Enzyme
Both
None
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Question # 9
Minimum energy required to start a chemical reaction is called:
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Potential energy
Chemical energy
Activation energy
All are same
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Question # 10
The molecule that fits the active sites that is called:
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Substrate
Enzyme
Catalyst
All
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Question # 11
When we add more substrate to an already occurring enzymatic reaction and there is no increase in the rate of reaction what would you predict?
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All active sites have been occupied by substrate molecules
The enzyme molecules have denatured
More substrate acted as inhibitor
More substrate has disturbed the pH of the medium
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Question # 12
Which of the following characters is not true about enzymes?
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Globular in shape
Non-specific
Protein in nature
Highly reactive
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