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Biology 9th Class English Medium Chapter 6 Online Test MCQs With Answers
Question # 1
Prosthetic by all enzymes :
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Required by all enzymes
Loosely attached with enzymes
Proteins In nature
Tightly bound to enzyme
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Question # 2
Which one of the following convert lipids to fatty acids?
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Protease
Lipase
Both
None
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Question # 3
What is true about cofactors?
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Break hydrogen bonds in proteins
Help facilitate enzyme activity
Increase activation energy
Are composed of proteins
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Question # 4
Non-protein part of enzymes are:
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Inhibitors
Substrate
Cofactors
Coenzymes
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Question # 5
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 # 6
Prosthetic groups are:
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Required by all enzymes
Loosely attached with enzymes
Proteins in nature
Tightly bound to enzyme
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Question # 7
Enzymatic reactions are _______ of times faster than uncatalyzed reactions:
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Millions
Hundreds
Thousands
Billion
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Question # 8
There are about ............. to ........ enzymes in cell.
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1000-2000
1000-2050
2000-6000
2000-3000
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Question # 9
Which one of the following convert protein to amino acids?
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Protease
Lipase
Both
None
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Question # 10
Pepsin works at the PH of ............... .
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1
2
3
4
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Question # 11
To what category of molecules do enzymes belong?
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Carbohydrates
Lipids
Nucleic acids
Proteins
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Question # 12
The enzyme function between a PH of ..................... .
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2 to 4
6 to 8
8 to 10
1 to 2
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Question # 13
Lock and key model was proposed by:
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Emil Fischer
Melcher
Koshland
Saugeo
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