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Chapter 22: Problem 95

Write the sequence of all possible tetrapeptides composed of the following amino acids. a. two phenylalanines and two glycines b. two phenylalanines, glycine, and alanine

Short Answer

Expert verified
For part a, there are \(6\) different possible sequences of tetrapeptides composed of two phenylalanines and two glycines: PPGG, PGPG, PGPP, GPPG, GPGP, and GGPP. For part b, there are \(12\) different possible sequences of tetrapeptides composed of two phenylalanines, one glycine, and one alanine: PPAG, PPGA, PAGP, PAPG, PGAP, PGPA, AGPP, APGP, APPG, GAPP, GAPG, GPAP, GPPA, and GPA.

Step by step solution

01

Part a: Two phenylalanines and two glycines

Since there are two phenylalanines (P) and two glycines (G), we can find all possible sequences by arranging these amino acids in different orders: 1. PPGG 2. PGPG 3. PGPP 4. GPPG 5. GPGP 6. GGPP There are \(6\) different possible sequences of tetrapeptides composed of two phenylalanines and two glycines.
02

Part b: Two phenylalanines, one glycine, and one alanine

In this case, we have two phenylalanines (P), one glycine (G), and one alanine (A). We can find all possible sequences by arranging these amino acids in different orders: 1. PPAG 2. PPGA 3. PAGP 4. PAPG 5. PGAP 6. PGPA 7. AGPP 8. APGP 9. APPG 10. GAPP 11. GAPG 12. GPAP 13. GPPA 14. GPA There are \(12\) different possible sequences of tetrapeptides composed of two phenylalanines, one glycine, and one alanine.

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