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Organic Chemistry with Biological Applications

John McMurry

Chapter 19

Biomolecules: Amino Acids, Peptides, and Proteins - all with Video Answers

Educators

Section 1

Structures of Amino Acids

03:05

Problem 1

How many of the $\alpha$ -amino acids shown in Table $19.1$ contain aromatic rings? How many contain sulfur? How many contain alcohols? How many contain hydrocarbon side chains?

Dalton Hilovsky
Dalton Hilovsky
Numerade Educator
02:17

Problem 2

Of the 19 L amino acids, 18 have the $S$ configuration at the $\alpha$ carbon. Cysteine is the only $\mathrm{L}$ amino acid that has an $R$ configuration. Explain.

Dalton Hilovsky
Dalton Hilovsky
Numerade Educator
02:52

Problem 3

The amino acid threonine, $(2 S, 3 R)-2$ -amino-3-hydroxybutanoic acid, has two chirality centers.
(a) Draw threonine, using normal, wedged, and dashed lines to show dimensionality.
(b) Draw a diastereomer of threonine, and label its chirality centers as $R$ or $S$.

Dalton Hilovsky
Dalton Hilovsky
Numerade Educator