Gel electrophoresis is used for:

Explain the method for the separation and isolation of $DNA$ fragments.

Which one of the following statements is wrong with respect to separation of $DNA$ fragments on gel electrophoresis?

When foreign $\text{DNA}$ is inserted into any vector,it results in inactivation of any marker gene. This is used for selection of $......\ :-$

In a chemical process,the $DNA$ fragments produced by restriction endonucleases can be separated by:

Which of the following steps are involved in the process of recombinant biotechnology? Arrange in correct order.
$I.$ Extraction of the desired gene product
$II.$ Amplification of the gene of interest
$III.$ Isolation of a desired $DNA$ fragment
$IV.$ Ligation of the $DNA$ fragment into a vector
$V.$ Insertion of recombinant $DNA$ into the host
Correct order is: