Multiple Choice Questions

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Mutation is more common when it is present in:

  • dominant condition

  • recessive condition

  • constant in population

  • none of the above


A.

dominant condition

Mutation is present in dominant condition because dominant mutant gene can express in both homozygous and heterozygous condition. While recessive gene can express only in homozygous condition.


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In DNA, which is absent ?

  • Adenine

  • Guanine

  • Uracil

  • Cytosine


e -DNA is formed from m-RNA by which enzyme:

  • restriction endonuclease

  • reverse transcriptase

  • DNA polymerase

  • RNA polymerase


Lymphocytes are formed by :

  • plasma cells

  • mast cells

  • liver cells

  • none of these


Set which includes only analogous organs is :

  • wings of butterfly, housefly and bat

  • hindlegs of horse, grasshopper and bat

  • wings of btterfly and Wingspread of bat and birds

  • mandibles of cockrach, mosquito and honey bee


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On high mountains, difficulty in breathing is due to :

  • decrease in partial pressure of O2

  • decrease in amount of O2

  • increase in CO2 conc

  • all of the above


Example of Analogous organs is :

  • wings of bird and insect

  • forelimbs of horse and man

  • teeth of elephant and man

  • none of the above


'Convergent Evolution' is shown by :

  • homologous organs

  • analogous organs

  • vestigial organs

  • above three


Which is called soluble RNA ?

  • rRNA

  • tRNA

  • mRNA

  • hnRNA


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In DNA, which is absent :

  • Adenine

  • Thymine

  • Guanine

  • Uracil