When polynucleotides are synthesized with repeating triplets of nucleotide residues, one, two, or three different polypeptide chains

Question:

When polynucleotides are synthesized with repeating triplets of nucleotide residues, one, two, or three different polypeptide chains will be produced in cell-free synthesis.
(a) Explain why these different results are possible.
(b) Predict polypeptides produced when the following are used with an E. coli system: (GUA)n ; (UUA)n