Which of the following features of genetic code does allow bacteria to produce human insulin by recombinant $DNA$ technology?

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.

Mutations which alter nucleotide sequence within a gene are called

Frame shift mutation occurs when

During protein synthesis in an organism, at one point the process comes to a halt. Select the group of the three codons from the following, from which anyone of the three could bring about this halt.