Which amino acid is encoded by only a single codon?

Which of the following statements regarding the genetic code is incorrect?
$i.$ The codon is a triplet.
$ii.$ $64$ codons code for amino acids.
$iii.$ The genetic code is unambiguous.
$iv.$ The genetic code is universal.
$v.$ $AUG$ has dual functions.

Which one of the following is the starter codon?

Initiation codon of protein synthesis (in eukaryotes) is

There are $64$ codons in the genetic code because....

Which of the following molecules contains the genetic code?