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. -1a carboxylate, +1 a-amino, 0 imidazole; 0 net charge Oa-carboxylate, +1 a-amino, +1 imidazole, +2 net charge +1a carboxylate, +1 a-amino; +1 imidazole, +3 net charge -1a-carboxylate; + 1 a-amino; +1 imidazole; +1 net charge -1a-carboxylate, 0 a-amino, +1 imidazole; 0 net charge
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. -1a carboxylate, +1 a-amino, 0 imidazole; 0 net charge Oa-carboxylate, +1 a-amino, +1 imidazole, +2 net charge +1a carboxylate, +1 a-amino; +1 imidazole, +3 net charge -1a-carboxylate; + 1 a-amino; +1 imidazole; +1 net charge -1a-carboxylate, 0 a-amino, +1 imidazole; 0 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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Question 14
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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
O 0a-carboxylate; +1 a-amino; +1 imidazole; +2 net charge
O +1 a-carboxylate; +1 a-amino; +1 imidazole; +3 net charge
O-1a-carboxylate; +1 a-amino; +1 imidazole; +1 net charge
O-1a-carboxylate; O 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 tryptophane
O lysine
O isoleucine
O serine
QUESTION 16
The side chain of
is most hydrophobic.
O valine
O alanine
O lysine
O glycine
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