Assume that a particular amino acid has an isoelectric point of 6.0. In a solution at pH 1.0, which of the following species will predominate?

\[{{H}_{2}}\overset{{}}{\mathop{N}}\,\overset{R}{\mathop{\overset{|}{\mathop{C}}\,}}\,HC{{O}_{2}}H\]

\[{{H}_{3}}\overset{+}{\mathop{N}}\,\overset{R}{\mathop{\overset{|}{\mathop{C}}\,}}\,HC{{O}_{2}}H\]

\[{{H}_{3}}\overset{+}{\mathop{N}}\,\overset{R}{\mathop{\overset{|}{\mathop{C}}\,}}\,HC{{O}_{2}}\]

\[{{H}_{2}}\overset{{}}{\mathop{N}}\,\overset{R}{\mathop{\overset{|}{\mathop{C}}\,}}\,HCO_{2}^{-}\]

Assume that a particular amino acid has an isoelectric point of 6.0. I

1.	Assume that a particular amino acid has an isoelectric point of 6.0. In a solution at pH 1.0, which of the following species will predominate?
A.	\[{{H}_{3}}\overset{+}{\mathop{N}}\,\overset{R}{\mathop{\overset{\|}{\mathop{C}}\,}}\,HC{{O}_{2}}H\]
B.	\[{{H}_{2}}\overset{{}}{\mathop{N}}\,\overset{R}{\mathop{\overset{\|}{\mathop{C}}\,}}\,HC{{O}_{2}}H\]
C.	\[{{H}_{3}}\overset{+}{\mathop{N}}\,\overset{R}{\mathop{\overset{\|}{\mathop{C}}\,}}\,HC{{O}_{2}}\]
D.	\[{{H}_{2}}\overset{{}}{\mathop{N}}\,\overset{R}{\mathop{\overset{\|}{\mathop{C}}\,}}\,HCO_{2}^{-}\]
Answer» B. \[{{H}_{2}}\overset{{}}{\mathop{N}}\,\overset{R}{\mathop{\overset{\|}{\mathop{C}}\,}}\,HC{{O}_{2}}H\]