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

The technique used to make numerous copies of a specific segment of $DNA$ quickly and accurately is

Upon exposure to $UV$ radiation,$DNA$ stained with ethidium bromide will show:

The diagram below refers to $PCR$. Identify the steps $A, B$ and $C$ and select the correct option.

How many types of primers are required for the amplification of a gene in $PCR$?

The different basic steps of genetic engineering are given below randomly:
$I.$ Identification of $DNA$ with desirable genes
$II.$ Gene transfer
$III.$ Maintenance of $DNA$ in host and gene cloning
$IV.$ Introduction of $DNA$ into host to form recombinant $DNA$
Which of the following represents the correct sequence of steps?