Organic Chemistry III
	Professor Carl C. Wamser
Chem 336 - Spring 2006	Pre-Quiz 27

(must be done in WebCT before Mon., May 22, 8:30 am)

1. Functional groups present in the dipeptide SerLys include all of the following except

a. amide  
* b. ester  
c. alcohol  
d. amine  
e. carboxylic acid

2. The highest pKa for His is 9.17, which means that at pH values above 9.17, it will predominantly exist with a charge of

a. -2  
* b. -1  
c. 0  
d. +1  
e. +2

3. In the Strecker synthesis of leucine, the original aldehyde would be

a. butanal  
b. 2-methylpropanal  
* c. 3-methylbutanal  
d. 2-methylpentanal  
e. 3-methylpentanal

4. An example of a protein's tertiary structure would be

a. an alpha helix  
b. a beta sheet  
c. its amino acid sequence  
* d. a disulfide bridge

5. The quaternary structure of hemoglobin includes how many different peptide chains?

a. 2  
b. 3  
* c. 4  
d. 5  
e. more than 5