The pH vs charge graph for a triprotic amino acid is shown below. Please answer the following questions about the amino acid. 1.5 1 0.5 -0.5 -1 2 4 8 10 12 14 pH a. Which of the following triprotic amino acids is this? [ Select ] b. What is the isoelectric point? (Please select the appropriate range in which the isoelectric point falls) (Hint - look up the pka values in the pka table for amino acids, which was in video one of today's lecture) [Select] c. What form of this amino acid dominates at a pH of 8? Please select the correct form for each ionizable group. Alpha amino [ Select] Alpha carboxyl [ Select ] R [ Select ] Net Charge

Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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The pH vs charge graph for a triprotic amino acid is shown below. Please answer the following
questions about the amino acid.
2
1.5
1
0.5
-0.5
-1
4
6.
8
10
12
14
pH
a. Which of the following triprotic amino acids is this? [ Select ]
b. What is the isoelectric point? (Please select the appropriate range in which the isoelectric point
falls) (Hint - look up the pka values in the pKa table for amino acids, which was in video one of
today's lecture) [ Select ]
c. What form of this amino acid dominates at a pH of 8? Please select the correct form for each
ionizable group.
Alpha amino [ Select ]
Alpha carboxyl [ Select ]
R [ Select ]
Net Charge
Transcribed Image Text:The pH vs charge graph for a triprotic amino acid is shown below. Please answer the following questions about the amino acid. 2 1.5 1 0.5 -0.5 -1 4 6. 8 10 12 14 pH a. Which of the following triprotic amino acids is this? [ Select ] b. What is the isoelectric point? (Please select the appropriate range in which the isoelectric point falls) (Hint - look up the pka values in the pKa table for amino acids, which was in video one of today's lecture) [ Select ] c. What form of this amino acid dominates at a pH of 8? Please select the correct form for each ionizable group. Alpha amino [ Select ] Alpha carboxyl [ Select ] R [ Select ] Net Charge
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