QQuestionBiochemistry
QuestionBiochemistry
Draw aspartic acid (aspartate) at pH 1, pH 7, and pH 13. Include hydrogen atoms.
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Answer
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Step 1:I'll solve this problem by drawing aspartic acid at different pH levels, showing the protonation states of its functional groups.
Step 2:: Understand Aspartic Acid Structure
Aspartic acid is an amino acid with three key functional groups: - Amino group (N-terminus) - Carboxyl group (C-terminus) - Side chain carboxyl group
Step 3:: Identify Protonation States at Different pH Levels
\begin{array}{c}
pH 1 (Fully Protonated): \text{H}_{3}^{+}N-\text{CH(CH}_{2}\text{COOH})_{2}-\text{COOH} \end{array} - Amino group fully protonated (positively charged) - Both carboxyl groups protonated (neutral) pH 7 (Zwitterion): \text{H}_{2}N-\text{CH(CH}_{2}\text{COO}^{-})_{2}-\text{COOH} \end{array} - Amino group neutral - Side chain carboxyl group deprotonated (negative) - C-terminus carboxyl group protonated (neutral) pH 13 (Fully Deprotonated): \text{H}_{2}N-\text{CH(CH}_{2}\text{COO}^{-})_{2}-\text{COO}^{-} \end{array} - Amino group neutral - Both carboxyl groups deprotonated (negative)
Final Answer
The three protonation states of aspartic acid at different pH levels have been illustrated, showing the progressive deprotonation of functional groups.
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