Chem 336 - Spring 2000
Organic Chemistry III
Dr. Carl C. Wamser

Chapter 28 Quiz

1. (4 points) Write the complete structure of base-paired A-T. Include all aspects of structure including the 3' and 5' phosphates of each nucleotide.

2. (2 points) Write the normal structure and the enol tautomer of cytosine.

3. (2 points) Write the base sequence (in the standard 5' to 3' direction) of the DNA strand that would be the complement of the m-RNA below.

5' - A U G G C U C A G - 3'

3' - T A C C G A G T C - 5' = 5' - C T G A G C C A T - 3'

4. (2 points) If the DNA of a particular organism is found to contain 22% C, what percentages of the other three bases would be expected?

22% C = 22% G

28% A = 28% T