Chem 336 - Spring 1999 - Organic Chemistry III
Portland State University - Dr. Carl C. Wamser

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Chapter 28 Quiz Answers

1. (2 points) Write the complete structure of cyclic AMP, in which the 3' and 5' positions are joined by a single phosphate.

2. (2 points) Use the table on the reverse side to determine what polypeptide would be encoded by the following sequence on m-RNA:

5'- AUG GAC GUC GCA -3'

Met-Asp-Val-Ala

Met could also represent "start"

3. (2 points) Write the base sequence (in the standard direction) of the DNA strand that would encode for (be the complement of) the m-RNA above.

5'- TGC GAC GTC CAT -3'

4. (2 points) If the DNA of a particular organism is found to contain 31% A, what percentages of the other three bases would be expected?

31% T , 19% G , 19% C

5. (2 points) Write the structure for the H-bonding pattern that links a base pair in DNA. Just show one complete base pair (either pair) as your example.

( see pictures in your text )