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Chapter 4: Q28P (page 96)

The twoC伪Hatoms of Gly are said to be prochiral, because when one of them is replaced by another group,C伪 becomes chiral. Draw a Fischer projection of Gly and indicate which H must be replaced withCH3to yield D-Ala.

Short Answer

Expert verified

Diagram for given condition is:

Step by step solution

01

Definition of  PI

The pH value at which a molecule has no electrical charge is known as the isoelectric point

02

Step 2:Draw a Fischer projection of Gly

The Gly can generate ala.

For Gly to generate ala, the boxed H (hydrogen molecule) must be substituted by CH3molecule.

Therefore, the diagram is:

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Most popular questions from this chapter

The protein insulin consists of two polypeptides termed the A and B chains. Insulins from different organisms have been isolated and sequenced. Human and duck insulins have the same amino acid sequence with the exception of six amino acid residues, as shown below. Is the pI of human insulin lower than or higher than that of duck insulin?

Lanthionine is a nonstandard amino acid consisting of two alanine residues linked via their 尾 carbon atoms by a thioether (鈥擲鈥�) linkage. Draw the structure of lanthionine.

(a) What is the net charge at neutral pH of a tripeptide containing only alanine? (b) How does the total number of negative and positive charges change following hydrolysis of the tripeptide?

The bacterially produced antibiotic gramicidin A forms channels in cell membranes that allow the free diffusion of Na+andK+ions, thereby killing the cell. This peptide consists of a sequence ofand-amino acids. The sequence of a segment of five amino acids in gramicidin A isR-Gly-L-Ala-D-Leu-L-Ala-D-Val-R'. Complete the Fischer projection below by adding the correct group to each vertical bond

The 20 standard amino acids are called伪-amino acids. Certain尾-amino acids are found in nature. Draw the structure of尾-alanine(3-amino-n-propionate).
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