Out of $64$ codons,$61$ codons code for $20$ different amino acids. What is this property of the genetic code called?

The chemical method developed by which of the following scientists was instrumental in synthesizing $\text{RNA}$ molecules with defined combinations of nitrogen bases?

Suppose evolution on Earth occurred in such a way that instead of $20$ amino acids,there were $96$ amino acids. If $DNA$ consisted of $12$ different types of bases and $DNA$ synthesis occurred in the same manner,what would be the minimum number of bases required for each $DNA$ codon?

The number of possible alternative bases in the codons of amino acids is . . . . . . .

Match the following columns:

Column-$I$ (Genetic Code)	Column-$II$ (Amino Acid)
$P$. $UAA$	$I$. Proline
$Q$. $CCA$	$II$. Glycine
$R$. $GGC$	$III$. Termination
$S$. $AGU$	$IV$. Serine

The degenerate nature of the genetic code is primarily associated with which position of the codon?