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Consider the amino acid lysine. Lysine has pK1 = 2.18, pK2 = 8.95, and pKR = 10.80. a. What is the pI for lysine? Show

Consider the amino acid lysine. Lysine has pK1 = 2.18, pK2 = 8.95, and pKR = 10.80.

a. What is the pI for lysine? Show how you did the calculation.

b. Draw a titration curve for lysine, similar to what is shown for glutamate in the lecture slides.

c. Draw the predominant structure of lysine present at pH 1, 4.5, 9.5, and 12. Label each drawing.

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