Rapid antigen test and $RT$-$PCR$ are two diagnostic tests for the $COVID-19$ virus. $PCR$,a molecular diagnostic tool,stands for:

  • A
    Polymerase Chain Reaction
  • B
    Polymerase Chain Reagent
  • C
    Physiological Chain Reaction
  • D
    Physiological Chain Reagent

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$A$ transformed bacterium with a human gene fails to produce the desired protein. The reason could be:

In gel electrophoresis,the separated bands of $DNA$ are cut out and extracted from the gel piece. This step is called

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Which of the following diagrams is correct for primer annealing in $PCR$?

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