Which of the following is the initiation codon?

Which of the following is the initiator codon?

Select the incorrect statement$(s)$.
$i.$ Six codons do not code for any amino acid.
$ii.$ Codon is read in $mRNA$ in a contiguous fashion.
$iii.$ Three codons function as stop codons.
$iv.$ The initiation codon $AUG$ codes for methionine.

Which of the following statements is $NOT$ true regarding the genetic code?

The codon $CUA$ $CUA$ $CUA$ codes for which of the following amino acids?

The possibility of a three-letter genetic code was first suggested by: