Where are the codons located?

$A$: Triplet genetic code can be confirmed by frame shift mutations.
$R$: Frame shifting involves the change in protein product coded by triplet codons.

Which of the following is the initiation codon?

Who discovered the chemical method for the synthesis of $RNA$ molecules with defined combinations of bases?

The property of a codon for always coding for a specific amino acid is called:

Which $RNA$ carries the genetic code?