Organic Chemistry III

Professor Carl C. Wamser

Chapter 27 Pre-Quiz

(must be done in WebCT before Mon., May 24, 8:30 am)

1. The only amino acid without a chirality center is

* a. glycine  
b. proline  
c. aspartic acid  
d. alanine  
e. glutamic acid

2. At pH 7, the charge on tyrosine would be primarily

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

3. Boc is an abbreviation for

a. a coupling reagent  
* b. an amine protecting group  
c. a carboxy protecting group  
d. a peptide  
e. an activating agent

4. In an electrophoresis experiment at pH 7, aspartic acid would be expected to migrate

a. very little  
b. towards the cathode  
* c. towards the anode

5. The beta-sheet is an example of a protein's

a. primary structure  
* b. secondary structure  
c. tertiary structure  
d. quaternary structure  
e. alpha-helix