You have been asked to examine organic material taken from a meteorite

thought to be extraterrestrial bacteria.  The nucleic acids that you examine have a nitrogenous base composition different from that of all known earth-based forms.  Specifically, RNA consisted of four different bases called W, X, Y, and Z.  The DNA contained one additional base called Q.  The proteins found, however, were found to contain the same 20 amino acids that make up terrestrial proteins.  You would like to decipher the genetic code of this creature and decide to emulate the Nobel Prize-winning approach of Khorana, Nirenberg, and Ochoa by synthesizing polynucleotides and determining the structure of translation products made from these sequences.  You obtain the following data.

5’ XYXYXYXYXYXY 3’ etc…  (Pro-leu) n
5’ XXYXXYXXYXXY 3’ etc…  (Pro) n, (Ala) n, and (Thr) n
5’ XXXYXXXYXXXY 3’ etc…  (Trp-Thr-Pro-Ala)n

If the genetic code of this organism is a commaless triplet code, what are the codons for proline, leucine, threonine, alanine and tryptophan?

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