The role of $DNA$ ligase in the construction of a recombinant $DNA$ molecule is:

  • A
    Formation of phosphodiester bond between two $DNA$ fragments
  • B
    Formation of hydrogen bonds between sticky ends of $DNA$ fragments
  • C
    Ligation of all purine and pyrimidine bases
  • D
    None of the above

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Explain the following terms in the context of Biotechnology:
$(a)$ $PCR$
$(b)$ Restriction enzymes and $DNA$
$(c)$ Chitinase

Which of the following is not a restriction endonuclease?

Which of the following techniques has made genetic engineering possible for living organisms?

$Taq$ polymerase used for the amplification of $DNA$ is associated with .........

What are the cells obtained from a cancerous tumor called?

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