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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

Explain the order of elution (with a buffer of pH 4) of the following pairs of amino acids through a column packed with Dowex 50 (Figure 21.3):

a. aspartate before serine c. valine before leucine

b. serine before alanine d. tyrosine before phenylalanine

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.Which amino acid has the lowest pI value?

b.Which amino acid has the highest pI value?

c.Which amino acid has the greatest amount of negative charge at pH = 6.20?

d.Which amino acid has a greater negative charge at pH = 6.20, glycine or methionine?

Why are buffer solutions of increasingly higher pH used to elute the column that generates the chromatogram shown in Figure 21.5? (Elutemeans wash out with a solvent.)

Calculate the pI of each of the following amino acids:

a.asparagine b. arginine c. serine d. aspartate
See all solutions

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