QUESTION 13 Titration of amino acids by a strong base, for example NaOH, results in two pks. The reaction occurring for the pk2 is correctly represented by which of the following reactions? Recall, Pky referes to titrotion of - NH2 + OH - NH+ H20 -COOH • NH2 - -Co0 + NH2* -coo + NH3 - -COOH + NH2 O COOH • OH - -COO+ H2O O- NH3• OH - -NH2 • H20
QUESTION 13 Titration of amino acids by a strong base, for example NaOH, results in two pks. The reaction occurring for the pk2 is correctly represented by which of the following reactions? Recall, Pky referes to titrotion of - NH2 + OH - NH+ H20 -COOH • NH2 - -Co0 + NH2* -coo + NH3 - -COOH + NH2 O COOH • OH - -COO+ H2O O- NH3• OH - -NH2 • H20
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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Question 13
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QUESTION 13
Titration of amino acids by a strong base, for example NaOH, results in two pks. The reaction occurring for the pk is correctly represented by which of the following reactions? Recall, Pky referes to titration of
- NH2 + OH - -NH+ H20
-COOH + NH2 -
-cO0 + NH2*
-coO + NH3* -
-COOH + NH2
-COOH + OH -
-COO+ H2O
- NH3 + OH -
-NH2 + H20
QUESTION 14
The pks of histidine for a-carboxylate =1.8; for a-amino =9.33; and for imidazole (side chain) =6.00. At pH 4, the charges on histidine would be as follows:
O-1a-carboxylate: +1 a-amino, O imidazole, 0 net charge
1a-amino; +1 imidazole; +2 net charge
+1 a-carboxylate; +1 a-amino; +1 imidazole; +3 net charge
O-1 a-carboxylate, +1 a-amino, +1 imidazole; +1 net charge
-1 a-carboxylate; 0 a-amino; +1 imidazole; 0 net charge
QUESTION 15
The side chain of
would become hydrophobic if its amino group is removed.
O tyrosine
O tryptonbane
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