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Average net charge of +2 predominates: а. b. The predominant species is +H3N-CH-((CH2)3-NH-C-NH2-NH2+)-COO- : Average net charge of arginine is 0: C.

Average net charge of +2 predominates: а. b. The predominant species is +H3N-CH-((CH2)3-NH-C-NH2-NH2+)-COO- : Average net charge of arginine is 0: C.

Biochemistry
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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Arginine 12 14.0 VI 12.0F 12.0 10.0F IV 10.0 8.0 8.0 pH 6.0 6.0 4.0- 4.0 2.0 2.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Eguiyslonts of Ou Below you can find the titration curve for arginine. The pH was monitored, and the results were plotted as shown in the graph. The key points in the titration are designated I to VI. For each of the statements (a) to (f), identify the appropriate key point in the titration. (pKa (СООН): 1.82, рКa (NH2): 8.99, pKa (R): 12.48) Average net charge of +2 predominates: The predominant species is +H3N-CH-((CH2)3-NH-C-NH2-NH2+)-COO- : Average net charge of arginine is 0: d. а. b. C. The pH is equal to the pka of the carboxyl group: Half of the backbone amino groups are protonated: Average net charge of arginine is +1/2: The carboxyl group has been completely titrated: е. f. g.
Transcribed Image Text:Arginine 12 14.0 VI 12.0F 12.0 10.0F IV 10.0 8.0 8.0 pH 6.0 6.0 4.0- 4.0 2.0 2.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Eguiyslonts of Ou Below you can find the titration curve for arginine. The pH was monitored, and the results were plotted as shown in the graph. The key points in the titration are designated I to VI. For each of the statements (a) to (f), identify the appropriate key point in the titration. (pKa (СООН): 1.82, рКa (NH2): 8.99, pKa (R): 12.48) Average net charge of +2 predominates: The predominant species is +H3N-CH-((CH2)3-NH-C-NH2-NH2+)-COO- : Average net charge of arginine is 0: d. а. b. C. The pH is equal to the pka of the carboxyl group: Half of the backbone amino groups are protonated: Average net charge of arginine is +1/2: The carboxyl group has been completely titrated: е. f. g.
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