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Chapter 24: Q1P (page 1262)

Draw three-dimensional representation of the following amino acids:

(a) L-alanine

(b) L-Leucine

(c) D-serine

(d) D-glutamine

Short Answer

Expert verified

(a), (b), (c) and (d) The diagrams are drawn below

Step by step solution

01

3D representation of organic compounds: 

Solid wedge:The bond that protrudes out of the plane of paper towards the viewer.

Dashed wedge: The bond that project away from the viewer or into the plane of the paper.

The bond in the plane of the paper is represented by a line.

02

Step 2(a) : 3-D representation of L-alanine:

L-Alanine

03

Step 3(b): 3-D representation of L-Leucine:

L-Leucine

04

Step 4(c): 3-D representation of D-Serine:

D-Serine

05

Step 5(d): 3-D representation of D-Glutamine:

D-Glutamine

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Most popular questions from this chapter

Show where trypsin and chymotrypsin would cleave the following peptide.

Tyr-Ile-Gln-Arg-Leu-Gly-Phe-Lys-Asn-Trp-Phe-Gly-Ala-Lys-Gly-Gln-Gln.NH2
  1. Show how you would use a Strecker synthesis to make phenylalanine.
  2. Propose a mechanism for each step in the synthesis in part (a).

Draw the electrophoretic separation of Trp, Cys, and His at pH 6.0.

Sometimes chemists need the unnatural D enantiomer of an amino acid, often as part of a drug or an insecticide. Most L-amino acids are isolated from proteins, but the D-amino acids are rarely found in natural proteins. D-amino acids can be synthesized from the corresponding L-amino acids. The following synthetic scheme is one of the possible methods.

(a) Draw the structures of intermediates 1 and 2 in this scheme.

(b) How do we know that the product is entirely the unnatural D configuration?

Give equations for the formation and hydrogenolysis of the glutamine benzyl ester
See all solutions

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