Multiple Choice Questions

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The one aspect which is not a salient feature of genetic code is its being

  • degenerate

  • ambiguous

  • universal

  • universal


D.

universal

The genetic code is degenerate, i.e, a given amino acid can be specified by more than one codons.
The genetic code inside the cell medium is said to be non-ambiguous because a particular condon always codes are same amino acid. But in certain rare cases the genetic code is found to be ambiguous, i.e some condon code for different amino acids under different conditions. The genetic code is almost universal.

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Which one of the following also acts as a catalyst in a bacterial cell?

  • sn RNA

  • hn RNA

  • 23 S rRNA

  • 23 S rRNA

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Silencing of mRNA has been used in producing transgenic plants resistant to

  • bollworms

  • nematodes

  • White rusts

  • White rusts

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The unequivocal proof of DNA as the genetic material came from the studies on a 

  • bacterium

  • fungus

  • viroid

  • viroid

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Which one of the following techniques made it possible to genetically engineer living organism

  • Recombinant DNA techniques

  • X -ray diffraction

  • Heavier isotope labelling

  • Heavier isotope labelling

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Which one of the following is used as a vector for cloning the gene into higher organisms?

  • Baculovirus

  • Salmonella typhimurium

  • Rhizopus nigricans

  • Rhizopus nigricans

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Which one of the following palindromic base sequences in DNA can be easily cut at about the middle be some particular restriction enzyme?

  • 5'-CGTTCG -3'
    3'-ATCCTA-5'

  • 5'-GATATG-3'
    3'-CTACTA-5'

  • 5'-GAATTC-3'
    3'CTTAAG-5'

  • 5'-GAATTC-3'
    3'CTTAAG-5'

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DNA and RNA segment tagged wit  a radioactive molecule is called

  • vector

  • probe

  • clone

  • clone

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Genetic engineering has been successfully used for producing

  • transgenic mice for testing safety to polio vaccine before use in humans

  • transgenic models for studying new treatments for certain cardiac diseases

  • transgenic cow -Rosie which produces high-fat milk for making ghee

  • transgenic cow -Rosie which produces high-fat milk for making ghee

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Satellite DNA is useful tool in 

  • Organ transplantation

  • sex determination

  • forensic science

  • forensic science

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