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Chapter 29: Q51P (page 1194)

Draw the structure for each peptide:

(a) Phe鈥揂la;

(b) Gly鈥揋ln;

(c) Lys鈥揋ly;

(d) R-H

Short Answer

Expert verified

a.

b.

C.

d.

Step by step solution

01

Peptide

Peptides are short chains of amino acid monomers linked with the peptide bonds. The shortest peptide are said to be di-peptides consisting of 2 amino acids linked by single peptide bond as followed by tri-peptide, tetra-peptide, and so on.

02

Structures of peptides

Phe-Ala, Gly-Gln, Lys-Gly, and R-H are dipeptide which has 2 amino acids with same/different constituent.

(a) Phe-Ala

Structure of Phe-Ala

(b) Gly-Gln

Structure of Gly-Gln

(c) Lys-Gly

Structure of Lys-Gly

(d) R-H

Structure of R-H

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Most popular questions from this chapter

a. Draw the structure of the tripeptide A-A-A, and label the two ionizable functional groups.

b. What is the predominant form of A-A-A at pH=1?

c. ThepKa values for the two ionizable functional groups (3.39 and 8.03) differ considerably from thepKa values of alanine (2.35 and 9.87;see table 29.1). Account for the observedpKa differences.

Question: Identify the functional groups in each molecule. Classify each alcohol, alkyl halide, amide, and amine as 1掳, 2掳, or 3掳

a.

b.

c.

d.

e.

f.

Which of the following amines can be used to resolve a racemic mixture of amino acids?

(a)

(b)

(c)

(d)

As shown in Mechanism 29.2, the final steps in the Edman degradation result in rearrangement of a thiazolinone to an N-phenylthiohydantoin. Draw a stepwise mechanism for this acid-catalyzed reaction.

Glutathione, a powerful antioxidant that destroys harmful oxidizing agents in cells, is composed of glutamic acid, cysteine, and glycine, and has the following structure:

Glutathione

a. What product is formed when glutathione reacts with an oxidizing agent?

b. What is unusual about the peptide bond between glutamic acid and cysteine?
See all solutions

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