Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Concept explainers

Neutral Amino Acids
Amino acids which do not have any charge on them are neutral amino acids.
Globular Protein
The globular proteins refer to the shape of protein specifically spherical in nature apart from spherical form fibrous, disordered and membrane-bound proteins exist. These globular proteins are miscible in water and form a colloidal solution rather than …
Dimer
Dimers are basic organic compounds, which are derivates of oligomers. It is formed by the combination of two monomers which could potentially be strong or weak and in most cases covalent or intermolecular in nature. Identical monomers are called homodime…
Dipeptide
A dipeptide is considered a mixture of two distinct amino acids. Since the amino acids are distinct, based on their composition, two dipeptide's isomers can be produced. Various dipeptides are biologically essential and are therefore crucial to industry.
Question
Which of the following statements regarding an amino acid with an ionizable side chain is TRUE? For glutamic acid, if the side chain is protonated, then the a-carboxyl group must also be protonated. None of the answers is correct. For aspartate, if the a-carboxyl group is protonated, then the side chain is also protonated. The pk of the side chain is always lower than the pk of the carboxyl group. All amino acids with ionizable side chains have charged side chains at physiological pH.
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Transcribed Image Text:Which of the following statements regarding an amino acid with an ionizable side chain is TRUE? For glutamic acid, if the side chain is protonated, then the a-carboxyl group must also be protonated. None of the answers is correct. For aspartate, if the a-carboxyl group is protonated, then the side chain is also protonated. The pk of the side chain is always lower than the pk of the carboxyl group. All amino acids with ionizable side chains have charged side chains at physiological pH.
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