BCHE341 NAME__________________________

Survey of Biochemistry

Quiz #1. Circle the best answer

Correct answer is bold

  1. A water molecule can from _____ hydrogen bonds.

A. one

  1. two
  2. three
  3. four

2. A hydroxyl group (R-OH) is

  1. a hydrogen bond donor
  2. a hydrogen bond acceptor
  3. both A and B
  4. neither A nor B

3. A carbonyl oxygen is

  1. a hydrogen bond donor
  2. a hydrogen bond acceptor
  3. both A and B
  4. neither A nor B

4. Relative amounts of a weak acid and its conjugate base in aqueous solution are

  1. impossible to determine
  2. not related to control of pH
  3. independent of pH
  4. can be related to the pH of the solution and the pKa of the weak acid

5. A zwitterion is a molecule that has

  1. a positive and a negative charge
  2. two positive charges
  3. two negative charges
  4. no electrical charges

6. Which substance would make the best buffer at pH 5.0?

  1. one with a pKa of 3.8
  2. one with a pKa of 4.8
  3. one with a pKa of 6.5
  4. one with a pKa of 8.0
  1. Buffering capacity refers to
  1. the effectiveness of commercial antacids
  2. the pH of a buffer solution
  3. the extent to which a buffer solution can counteract the effect of added acid or base
  4. the molecular weight of the substance used as a buffer