Answer:
Eight (8) different artificial mRNA 3 nucleotide codons possibly made.
Explanation:
According to above scenario, when we add polynucleotide phosphorylase into the solution of adenosine triphosphate and guanosine triphosphate there will be 8 different artificial mRNA containing 3 base sequence (codons) possibly be made while if code involves two base sequence there will be possibly 4 different codons.

The digestion of protein begins at mouth and it continues at stomach and small intestine.
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Well, it is possible that those stop codons have dual functions. They can act as stop signals or, on the other hand, they can be used to incorporate amino acids.
Other explanation is that multiple stop codons may reduce the rate of nonsense mutation.