The twenty third pair of chromosomes in man is known as

$A$ : Nutritional mutant strain of pink mould is auxotroph.
$R$ : It is not able to prepare its own metabolites from the raw materials obtained from outside

In which step of $DNA$ profiling, nitrocellulose membrane is used?

Assertion: $mRNA$ attaches to ribosome through its $3'$ end.

Reason: The $mRNA$ has $F-$ capsular nucleotide and bases of lagging sequence.

Who was awarded Nobel Prize for synthesis of $RNA$ in $1959$