The chirality of an amino acid results from the fact that its alpha carbon 1. is a carboxylic acid 2. is bonded to 4 different groups 3. is symmetric 4. has no net charge 5. none of the above
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Chirality refers to a property of a molecule that makes it non-superimposable on its mirror image, much like left and right hands. Show more…
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The amino acids with charged side chains include: A) aspartate, glutamate, lysine and arginine B) aspartate, glutamate and glycine C) aspartate, glutamate, lysine, glycine and arginine D) Alanine and serine The chirality of an amino acid results from the fact that its ̑ carbon: A) Has no net charge B) Is a carboxylic acid C) Is bonded to four different chemical groups D) Is in the L absolute configuration in naturally occurring proteins Of the 20 standard amino acids, only ___________ is not optically active. The reason is that its side chain ___________. A) Alanine; is a simple methyl group B) Glycine; is a hydrogen atom C) Serine; contains an alcohol D) Lysine; contains only nitrogen Which one of the following statements about cystine is correct? A) Cystine forms when the —CH2—SH R group is oxidized to form a —CH2—S—S—CH2— disulfide bridge between two cysteines. B) Cystine is an example of a nonstandard amino acid, derived by linking two standard amino acids. C) Cystine is formed by the oxidation of the carboxylic acid group on cysteine. D) Cystine is formed through a peptide linkage between two cysteines. Draw the complete structure showing all atoms of the tripeptide Phe-Asp-Pro.
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The structure of the amino acid Proline cannot be placed into the class of α- amino acids because of: a. its lack of a polar side chain. b. its lack of a non-polar side chain. c. its lack of a primary amino and carboxylic acid group. d. its inability to disassociate in a strong acid.
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The structural feature which distinguishes proline from other amino acids is that (a) it is optically inactive (b) it is a secondary amine (c) it contains two carboxylic acid groups (d) it contains two amino groups
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