Chemistry 332 - Spring 1996
Elements of Organic Chemistry II


Quiz, Chapter 16 - Lipids and Nucleic Acids
Take-Home Quiz - Answer Key

Due Thursday, May 30, 1996, 4:30 pm (at the start of class)


1. (3 points) Write a structure for the monoglyceride obtained from oleic acid, where the ester is linked at C-1 of glycerol. Write a complete IUPAC name for this compound. Illustrate the reaction that would occur when this compound is hydrogenated.




2. (3 points) Write a clear picture of the normal hydrogen-bonding pattern in A-T. An alternative pattern is possible using the adenine N in the 5-membered ring rather than the 6-membered ring. Write the hydrogen-bonding pattern for this possibility.



Sometimes both types of H-bonding occur simultaneously, in which case DNA is in a triple helix.


3. (4 points) Identify a base sequence that would code for the tripeptide TrpMetGly. Include the stop codon.
Indicate what the base sequence would be for:

a) the original DNA

(5') TGG ATG GGG TAA (3')
(note that there are additional possibilities for the three italicized sites above, and the same will hold true for their corresponding base-paird strands)

b) the complementary DNA that is transcribed by m-RNA

(3') ACC TAC CCC ATT (5')

c) m-RNA

(5') UGG AUG GGG UAA (3')
(the codons for Trp, Met, Gly, and stop, as read from Table 16.3)

d) each of the t-RNAs

the anticodons are:
for Trp: (3')ACC(5')
for Met: (3')UAC(5')
for Gly: (3')CCC(5')
for stop: (3')AUU(5')