BIO QUIZ CHAPTER 3

Which of the following is possible due to cohesion (the high surface tension) of water? a. Lakes don't freeze solid in winter, despite low temperatures. b. A water strider walks across the surface of a small pond. c. Organisms resist temperature changes, although they give off heat due to chemical reactions. d. Water can act as a solvent. e. The pH of water remains exactly neutral.

b

pH below 7 means a. stable b. neutral c. acidic d. alkaline.

c

Buffer is a substance that a. change the pH in a solution. b. increase the pH in a solution. c. decrease the pH in a solution. d. minimize the change of pH in a solution.

d

Which of the following statements is true about buffer solutions? a. They maintain a constant pH when bases are added to them but not when acids are added to them. b. They maintain a constant pH when acids are added to them but not when bases are added to them. c. They maintain a constant pH of exactly 7 in all living cells and biological fluids. d. They maintain a relatively constant pH. e. They are found only in living systems and biological fluids.

d