Biology MCQs

Page No. 97

Resolution power of a compound microscope is___________?


a2.0 ?m


b2-4 A


c24 ?m


d24 A


View Answer 2.0 ?m

Extreme change in pH results in______________?


aChange in ionization of amino acids at the active site of the enzyme


bChange in the ionization of the substrate


cDenaturation of the enzyme


dIncrease in the reaction rate



Who opposed the idea the cell is an empty space bounded by thick wall?


aLorenz Oken


bSchwann


cRobert Brown


dRudolph Virchow


View Answer Robert Brown

If more substrate to already occurring enzymatic reaction is added and there is no effect on the rate of the reaction what is the form given to this situation___________?


aSaturation


bDenaturation


cComposition


dInhibition


View Answer Saturation

Factory of Ribosomal systhesis is__________?


aCytoplasm


bNucleus


cNucleolus


dEndoplasmic reticulum


View Answer Nucleolus

The active site of an enzyme______________?


aNever changes


bForms no chemical bond with substrate


cDetermined by structure and the specificity of the enzyme


dThey are non specific in their action



If the concentration of enzyme is kept constant and amount of substrate is increased a point is reached where increase in substrates concentration does not affect the reaction rate because of____________________?


aEnzymes get denatured at higher substrate conc


bRate of reaction is indirectly proportional to substrate concentration at this point


cAll the active sites on enzyme molecule are occupied


dNone of these



Which statement is incorrect about Lock and Key Model________________?


aSpecific enzyme can transform only a specific substrate


bActive site of an enzyme is a non flexible structure


cActive site does not change before during or even after the reaction


dIt explains the mechanism of every chemical reaction



The rate of reaction is directly proportional to the concentration of an enzyme which statement is incorrect in this respect_________________?


aIncrease in enzyme molecule increases the available active sites.


bThis relation is for unlimited time period with unlimited enzyme concentration


cIf the concentration is doubled the rate will become two fold.


d None of these.



A group of ribosomes attached to mRNA is known as___________?


aPolymer


bPolypeptide


cPolysomes


dMonomer


View Answer Polysomes

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