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Which of the following shows the structure of aspartic acid at pH 11? a H₂N. ОН ОН b H₂N ОН с H₂N ОН d H₂N.

Which of the following shows the structure of aspartic acid at pH 11? a H₂N. ОН ОН b H₂N ОН с H₂N ОН d H₂N.

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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**Question:** Which of the following shows the structure of aspartic acid at pH 11? **Options:** - **a)** Chemical structure featuring: - Amine group (NH2) - Carboxyl group (COOH) - Second carboxyl group (COOH) - **b)** Chemical structure featuring: - Protonated amine group (NH3^+) - Deprotonated carboxyl group (COO^-) - Second carboxyl group (COOH) - **c)** Chemical structure featuring: - Protonated amine group (NH3^+) - Deprotonated carboxyl group (COO^-) - Second deprotonated carboxyl group (COO^-) - **d)** Chemical structure featuring: - Amine group (NH2) - Two deprotonated carboxyl groups (COO^- and COO^-) **Choices:** - ⬜ A - ⬜ B - ⬜ C - ⬜ D **Analysis:** At pH 11, which is a basic pH, aspartic acid exists in a deprotonated state. Therefore, the correct structure of aspartic acid at this pH would include a neutral amine group (NH2) and two deprotonated carboxyl groups (COO^-).
Transcribed Image Text:**Question:** Which of the following shows the structure of aspartic acid at pH 11? **Options:** - **a)** Chemical structure featuring: - Amine group (NH2) - Carboxyl group (COOH) - Second carboxyl group (COOH) - **b)** Chemical structure featuring: - Protonated amine group (NH3^+) - Deprotonated carboxyl group (COO^-) - Second carboxyl group (COOH) - **c)** Chemical structure featuring: - Protonated amine group (NH3^+) - Deprotonated carboxyl group (COO^-) - Second deprotonated carboxyl group (COO^-) - **d)** Chemical structure featuring: - Amine group (NH2) - Two deprotonated carboxyl groups (COO^- and COO^-) **Choices:** - ⬜ A - ⬜ B - ⬜ C - ⬜ D **Analysis:** At pH 11, which is a basic pH, aspartic acid exists in a deprotonated state. Therefore, the correct structure of aspartic acid at this pH would include a neutral amine group (NH2) and two deprotonated carboxyl groups (COO^-).
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