Multiple Choice Questions

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Repressor protein is produced by

  • regulator gene

  • operator gene

  • structural gene

  • promoter gene


A.

regulator gene

The regulator gene is responsible for the synthesis of a protein called repressor. It may be active or inactive (aporepressor). The active repressor is normally seen in inducible systems while aporepressor is seen in repressible system. The repressor has an affinity for operator gene.


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Which of the following is used as a best genetic vector in plants?

  • Bacillus thurengiensis

  • Agrobacterium tumifaciens

  • Pseudomonas putida

  • All of the above


Yersinia pestis is responsible for

  • syphilis

  • whooping cough

  • plague

  • leprosy


Ovulation takes place in a month between

  • 11-14 day

  • 14-16 day

  • 15-28 days

  • 21-26 day


Pneumatic bones are expected to be found in

  • house lizard

  • flying fish

  • pigeon

  • tadpole of frog


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Balbiani rings are the structural features of

  • allosomes

  • polytene chromosomes

  • autosomes

  • Lampbrush chromosomes


Presence of tail in a child is an example of

  • atavism

  • divergent evolution

  • convergent evolution

  • mutation


Accessory sexual character in female is promoted by

  • androgen

  • progesterone

  • estrogen

  • testosterone


X- linked recessive gene is

  • always expressed in male

  • always expressed in femlae

  • lethal

  • sub- lethal


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Mesozoic era is Golden period of

  • reptiles

  • Mollusca

  • fishes

  • amphibians