Final answer:
The six possible tripeptides from Ala (Alanine), Pro (Proline), and Ser (Serine) are Ala-Pro-Ser (APS), Ala-Ser-Pro (ASP), Pro-Ala-Ser (PAS), Pro-Ser-Ala (PSA), Ser-Ala-Pro (SAP), and Ser-Pro-Ala (SPA), with the three-letter abbreviations separated by hyphens and the one-letter abbreviations written consecutively.
Step-by-step explanation:
The student has asked to write the 1 and 3-letter abbreviations of the tripeptides possible from Ala (Alanine), Pro (Proline), and Ser (Serine). Since there are three different amino acids and each can occupy any of the three positions in a tripeptide, we can create a total of 3! (3 factorial) or 6 different sequences.
Here are the three-letter and one-letter abbreviations of all possible tripeptides:
- Ala-Pro-Ser (APS)
- Ala-Ser-Pro (ASP)
- Pro-Ala-Ser (PAS)
- Pro-Ser-Ala (PSA)
- Ser-Ala-Pro (SAP)
- Ser-Pro-Ala (SPA)
The three-letter abbreviations are written with hyphens and the one-letter abbreviations are written without any separators. This practice is consistent with how the primary structure of proteins is represented, going from the N-terminus to the C-terminus.