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Chapter 21: Q27P (page 1004)

Draw the resonance contributors of the peptide bond in the less stable configuration.

Short Answer

Expert verified

The amide bonds that link amino acids are called peptide bonds. When the identities of the amino acids in a peptide are known but their sequence is not known, the amino acids are written separated by commas. When their sequence is known, the amino acids are written connected by hyphens.

Step by step solution

01

Step-by-step-solutionStep 1: Peptide bond

The amide bonds that link amino acids are called peptide bonds. When the identities of the amino acids in a peptide are known but their sequence is not known, the amino acids are written separated by commas. When their sequence is known, the amino acids are written connected by hyphens.

02

Less stable configuration of peptide bond

A peptide bond is formed between the carboxyl group of one amino acid and an amino group of another amino acid. The less stable configuration is the cis configuration which is represented as follows:

Peptide bond with less stable configuration

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Most popular questions from this chapter

What amino acid is formed using the N-phthalimidomalonic ester synthesis when the following alkyl halides are used in the third step?

(a)

(b)CH3SCH2CH2Br

A mixture of amino acids that do not separate sufficiently when a single technique is used can often be separated by two-dimensional chromatography.In this technique, the mixture of amino acids is applied to a piece of filter paper and separated by chromatographic techniques. The paper is then rotated90°,and the amino acids are further separated by electrophoresis, producing a type of chromatogram called a fingerprint.Identify the spots in the fingerprint obtainedfrom a mixture of Ser, Glu, Leu, His, Met, and Thr.

a. What percentage of the α-amino group of lysine will be protonated at its pI?<25%50% >75%

b. Answer the same question for theε-amino group of lysine.

What is the configuration about each of the asymmetric centres in aspartame?

Question: In determining the primary structure of insulin, what would lead you to conclude that insulin had more than one polypeptide chain?
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