Biology MCQs

Page No. 96

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_______________?


aCo-enzyme


bBlocker


cInhibitor


dCofactor


View Answer Inhibitor

A substance which binds at the active site of the enzyme but does not result in the formation of the products is called________________?


aIrreversible inhibitor


bReversible inhibitor


cCompetitive inhibitor


dNon-competitive inhibitor


View Answer Competitive inhibitor

Which of the statement about cell membrane is not true?


aIt contains protein molecules embedded in lipid bilayer


bIt is a differentially permeable membrane.


cIt contains charged pores thus ions being charged particles cross cell membrance much easier than neutral particles.


dIt may get infolded to engulf solid or liquid material.



Inhibitors which block the enzyme by forming weak bond are called___________?


aCompetitive inhibitors.


bNon-competitive inhibitors


cIrreversible inhibitors.


dBoth a and b


View Answer Both a and b

Magnifying power of electron microscope as compared to eye is____________?


a500 X


b250000X


c500000X


d250X


View Answer 250000X

Malonic acid is an example of____________?


aIrreversible inhibitor


bReversible inhibitor


cCompetitive inhibitor


dNon-competitive inhibitor


View Answer Competitive inhibitor

The structure of an enzyme is altered by____________?


aIrreversible inhibitor


bReversible inhibitor


cCompetitive inhibitor


dNon-competitive inhibitor



In cell fractionation various components of cells including its organelles can be isolated in different layers depending upon____________?


aTheir physical properties like size & weight.


bPhysical properties of the medium like its density.


cTheir electrical properties like their charges


dBoth a and b


View Answer Both a and b

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____________________?


aincrease in concentration of enzyme


bincrease in concentration of substrate


cincrease in pH


dincrease in temperature



Excessive increase in temperature of medium causes the enzyme molecule to____________?


aActivate


bUnaffected


cDenatured


dNone of these


View Answer Denatured

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