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Restriction endonucleases are used in genetic engineering and they

cut DNA at various sites
join DNA segments
cut RNA at specific sites
cut DNA at specific sites


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The first transgenic crop was

Pea
Tobacco
Flax
Cotton


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The transgenic animals are those which have

foreign DNA in some of their cells
foreign DNA in all of their cells
foreign RNA in all of their cells
Both (A) and (C)


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The two strands of DNA are held together by bonds of

Nitrogen
Oxygen
Hydrogen
Carbon


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Cry genes or Bt genes are obtained from

Cotton pest
Tobacco plant
Bacillus thuringiensis
E - Coli


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Which is related to genetic engineering?

Plastid
Plasmid
Heterosis
Mutation


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Which of the following features should be present in vector?

It should replicate autonomously
It should have its own origin of replication
It should possess restriction enzyme cleavage sites
All of these


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For transformation, micro-particles coated with DNA to be bombarded with gene gun are made up of

Silicon or Platinum
Gold or Tungsten
Silver or Platinum
Platinum or Zinc


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The linking of antibiotic resistance gene with the plasmid vector became possible with:

Endonucleases
DNA ligase
Exonucleases
DNA polymerase


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Restriction endonucleases:

Are synthesized by bacteria as part of their defense mechanism
Are used for in vitro DNA synthesis
Are used in genetic engineering for ligation of two DNA molecules
Are present in mammalian cells for degradation of DNA when the cell dies


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