What are those structures that appear as 'beads-on-string' in the chromosomes when viewed under electron microscope?

• Nucleotides

• Nucleosomes

• Base pairs

• Base pairs

The process of RNA interference has been used in the development of plants resistant to 

• fungi

• viruses

• insects

• insects

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

• sn RNA

• hn RNA

• 23 S rRNA

• 23 S rRNA

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

• bollworms

• nematodes

• White rusts

• White rusts

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

• bacterium

• fungus

• viroid

• viroid

196.

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

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

• Baculovirus

• Salmonella typhimurium

• Rhizopus nigricans

• Rhizopus nigricans

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

• degenerate

• ambiguous

• universal

• universal

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'

DNA and RNA segment tagged wit  a radioactive molecule is called

• vector

• probe

• clone

• clone