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Question: 12 which amino acid is not chiral and why 13...

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12. Which amino acid is not chiral and why? 13. Which amino acid contains a thioether group? a. Cysteine b. Proline c. Glutamine d. Methionine 14. Which amino acid has an indole ring? a. Histidine b. Proline c. Tryptophan d. Tyrosine 15. Which amino acid has an imidazole ring? a. Proline b. Tyrosine c. Histidine d. Phenylalanine 16. Which amino acid has a pyrroldine ring? 17. Name two aromatic amino acids? 18. Which amino acid has a guanidinium group on its side chain? Draw it? 19. What is the name of each amino acid in the polypeptide DFACTLEQPW? 20. Draw the predominant form of lysine when it is in a solution that has a pH of 12? 21. In a solution where Histidine, Aspartic acid, and Tyrosine are free amino acids and the pH of the solution is 3.5, which amino acids R group will deprotonate first? (Hint: Think about where the proton that will dissociate is and what type of functional group it is associated with.) 22. What is released when two amino acids form a peptide bond? What kind of reaction is this? 23. A peptide bond is formed between which two atoms? 24. At physiological pH, what is the charge of the tripeptide Cys-His-GIn? 25. In a solution with pH of 3.5, what is the charge of the predominant pentapeptide Gly-Tyr-Glu Asn-Met?
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