Entry Test MCQ :: Enzymes p2

NOTE :ANSWERS ARE PRESENT AFTER 5 MCQs

16.	The active site of an enzyme:
	A. Never changes B. Forms no chemical bond with substrate C. Determined by structure and the specificity of the enzyme. D. They are non specific in their action.

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17.	Excessive increase in temperature of medium causes the enzyme molecule to
	A. Activate B. Unaffected C. Denatured D. None of these.

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18.	Extreme change in pH results in:
	A. Change in ionization of amino acids at the active site of the enzyme. B. Change in the ionization of the substrate. C. Denaturation of the enzyme D. Increase in the reaction rate.

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19.	Optimal temperature of enzymes present in human body is
	A. 27?C B. 37?C C. 47?C D. 30?C

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20.	A chemical substance which can react (in place of substrate) with the enzyme but is not transformed into product/s and thus blocks the active site temporarily or permanently is called
	A. Co-enzyme B. Blocker C. Inhibitor D. Cofactor ANSWERS OF ABOVE FIVE MCQs16.(C) 17.(C) 18.(C) 19.B() 20.(C)

21.	Inhibitors which block the enzyme by forming weak bond are called
	A. Competitive inhibitors. B. Non-competitive inhibitors C. Irreversible inhibitors. D. Both a and b

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22.	A substance which binds at the active site of the enzyme but does not result in the formation of the products is called:
	A. Irreversible inhibitor B. Reversible inhibitor C. Competitive inhibitor D. Non-competitive inhibitor

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23.	The structure of an enzyme is altered by:
	A. Irreversible inhibitor B. Reversible inhibitor C. Competitive inhibitor D. Non-competitive inhibitor

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24.	Malonic acid is an example of:
	A. Irreversible inhibitor B. Reversible inhibitor C. Competitive inhibitor D. Non-competitive inhibitor

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25.	If enzyme concentration is low than substrate pH and temperature values are equal to requirement then which of the following will increase rate of reaction.
	A. increase in concentration of enzyme B. increase in concentration of substrate C. increase in pH D. increase in temperature

ANSWERS OF ABOVE FIVE MCQs
21.(D) 22.(C) 23.(A) 24.(C) 25.(A)