During the purification process for recombinant $DNA$ technology,the addition of chilled ethanol precipitates out:

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

Which of the following range of temperature is required for denaturation,annealing of primer,and primer extension of $PCR$ respectively?

Which of the following is not required for $PCR$?

In $pBR322$,foreign $DNA$ is inserted using the restriction enzyme $Cla\, I$. If this recombinant plasmid is introduced into bacteria,which of the following will occur regarding growth on antibiotic-containing media?

Select the appropriate option for $RNAi$.