Identify the mismatched pair.

Match List-$I$ with List-$II$ :

List-$I$	List-$II$
$a$. Gene gun	$i$. Replacement of a faulty gene by a normal healthy gene
$b$. Gene therapy	$ii$. Used for transfer of gene
$c$. Gene cloning	$iii$. Total $DNA$ in the cells of an organism
$d$. Genome	$iv$. To obtain identical copies of a particular $DNA$ molecule

Choose the correct answer from the options given below:

Read the following four statements $(1-4)$ and identify the two statements that contain mistakes:
$1.$ The first transgenic buffalo,Rosie,produced milk which was human alpha-lactalbumin enriched.
$2.$ Restriction enzymes are used in the isolation of $DNA$ from other macromolecules.
$3.$ Downstream processing is one of the steps of $R-DNA$ technology.
$4.$ Disarmed pathogen vectors are also used in the transfer of $R-DNA$ into the host.
Which are the two statements having mistakes?

The transfer of the streptomycin resistance gene from $Nicotiana$ $tabacum$ to $Nicotiana$ $sylvestris$ was achieved through which method?

Explain the use of biotechnology in various fields.

Genetic engineering is associated with: