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- 1. Multiple Choice
Which one is the zwitterion form of alanine?
- 2. Multiple Choice
Alanine has two pKa (2.35, 9.87). Which one is the major form at alanine at pH = 6?
- 3. Multiple Choice
Alanine has two pKa (2.35, 9.87). What is the net charge of alanine at pH = 11?
0
-1
+1
- 4. Multiple Choice
Aspartic acid has an acidic side chain. The pKa of main chain and side chain COOH are 2.10 and 3.86 respectively. Which one is the major form of aspartic acid at pH = 3?
- 5. Multiple Choice
Lysine has a basic side chain. The pKa for the main chain and side chain -NH2 are 8.95 and 10.53 respectively. Which one is the major form of lysine at pH = 10?
- 6. Multiple Choice
The pKa for glutamic acid -COOH, -NH2 and side chain are 2.10, 9.47 and 4.07 respectively. What is the pH at the isoelectric point of glutamic acid?
3.08
6.77
5.19
- 7. Multiple Choice
The pKa for lysine -COOH, -NH2, and side chaine (-NH2) are 2.18, 8.95, and 10.53 respectively. What is the pH at the isoelectric point of lysine?
5.56
9.74
6.35
- 8. Multiple Choice
Glutamine has two pKa (2.17 and 9.13). Which one is the major form of glutamine at pH = 1.5?
- 9. Multiple Choice
Which part of the titration curve is the isoelectric point of alanine?
II
III
- 10. Multiple Choice
This titration curve is likely to be ..
glycine
glutamic acid
lysine
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