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51. A peptide chain has the following pKa’s: His: 2.44, 6.02, 9.66 Ala: 2.37, 9.58 Glu:...

51. A peptide chain has the following pKa’s:

His: 2.44, 6.02, 9.66

Ala: 2.37, 9.58

Glu: 2.11, 4.21, 9.31

Tyr: 2.29, 9.64

Asp: 1.84, 3.97, 9.83

Determine the isoelectric point of His-Ala-Glu-Tyr-Asp.

  1. a. 2.91
  2. b. 7.84
  3. c. 5.12
  4. d. 4.09
  5. e. 9.75

Please provide your work, the correct answer is 7.84 but I keep getting the wrong answer...

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