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

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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

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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

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View Answer Saturation

Factory of Ribosomal systhesis is__________?


aCytoplasm

✖


bNucleus

✖


cNucleolus

✓


dEndoplasmic reticulum

✖


View Answer Nucleolus

The active site of an enzyme______________?


aNever changes

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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

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bActive site of an enzyme is a non flexible structure

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

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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.

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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.

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A group of ribosomes attached to mRNA is known as___________?


aPolymer

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bPolypeptide

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cPolysomes

✓


dMonomer

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View Answer Polysomes

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