Quiz 3, BICH 410 (TuTh 12:45-2), Tuesday, Nov. 5, 1996

Clearly circle the letter corresponding to your answer for each problem. There are seven problems, six of which count 3 points, and one is worth 2 points. No partial credit given for multiple-choice questions.

1. The structure of ATP
Answer: A

2. Which of the following properties is NOT common to D-glucose and D-ribose?
Answer: D

3. Which of the following statements about glycosaminoglycans is true?
Answer: D

4. If one carries out the partial mild acid hydrolysis of glycogen or starch and then isolates from the product all the trisaccharides present, how many different kinds of trisaccharides are possible? Disregard alpha or beta anomers.
Answer: D; trisaccharide means two glycosidic linkages and the possible linkages are 1-4 or 1-6; hence, possible structures are i) both 1-4 linkages; ii) one 1-4 and one 1-6 linkage on "left" monosaccharide; iii) one 1-4 and one 1-6 linkage on "right" monosaccharide; iv) both 1-6 linkages

5. The structures of thymine and uracil differ because:
Answer: B

6. From the abbreviated name of the compound Gal(ß1->4)Glc, we know that: (Gal = galactose; Glc = glucose)
Answer: E

7. (2 pts) If a region of one strand of a DNA double helix has the sequence 5'-ACCTGGAATTC-3', what is the sequence of the complementary region of the other strand?
Answer: C