Which sets of mRNA codons could genetically code for a protein with the following amino acid composition: Pro - Asp - Gly - Lys

The genetic code is degenerate. Some amino acids are encoded by more than one codon, inasmuch as there are 64 possible base triplets and only 20 amino acids. In fact, 61 of the 64 possible triplets specify particular amino acids and 3 triplets (called stop codons) designate the termination of translation.