Why does proline not give a positive test with ninhydrin?
A) The secondary amine of proline is too weak a nucleophile to add to ninhydrin.
B) The 
of the ammonium in proline (10.6) is too high to react with ninhydrin.
C) Hydrolysis of the second imine in the reaction mechanism cannot occur with proline.
D) The first imine cannot form in the reaction between proline and ninhydrin.
E) The second imine formed by decarboxylation in the mechanism is too unstable to form.
Correct Answer:
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Q6: The isoelectric point Q7: The first Merrifield machine produced a 125 Q8: Which of these structures correctly shows proline Q9: Which of these is the correct Fischer Q10: Given the following information about a polypeptide Q12: A certain amino acid has Q13: Which statement is true about aspartic acid Q14: Which of these structures are L-amino acids? Q15: Which of the following would you use Q16: Which of the following properties dictate the
Hydrolysis
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