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

In a bioreactor,through which system can a small volume of culture be withdrawn periodically?

What are bioreactors?

Which of the following is not a step of downstream processing?

Which of the following statements are correct with respect to $DNA$ separation, isolation and visualization?
$A$. The cutting of $DNA$ is done by molecular scissors.
$B$. The $DNA$ fragments separate according to their size in an agarose gel, upon electrophoresis.
$C$. The separated $DNA$ fragments can be seen without staining when exposed to $UV$ light.
$D$. The separated $DNA$ fragments, when stained with ethidium bromide, can be seen in visible light.
Choose the correct answer from the options given below:

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