QUIZ 1, BICH 410( MWF 1:50 PM), Friday, Sept. 16, 1994

Clearly circle the letter corresponding to your answer for each problem. There are six problems and each count 3 points. You get two free points for this quiz. No partial credit given for multiple-choice questions.

1. The three-dimensional structure of macromolecules is formed and maintained primarily through noncovalent interactions. Which of the following is not considered a noncovalent interaction?

2. Phosphoric acid (H3PO4) has three ionizable protons, with pKas of 2.14, 6.86, and 12.4. The ionic form that predominates at pH 8.5 is:

3. What functional group is not present in tyrosine?

4. The pH of a sample of blood is 7.4. The pH of a sample of gastric juice is 1.4. The blood sample has:

5. For amino acids with neutral R groups, at any pH below the pI of the amino acid, the population of amino acids in solution will:

6. Fifty mL of 0.1 M NaOH is added to 100 mL of 0.1 M lactic acid. Lactic acid has a pKa of 4.1. The resulting mixture has a pH close to: