Enzymes (Multiple Choice)

Enzymes
  a. control the speed of a reaction.
  b. change shapes to facilitate certain reactions.
  c. may place physical stress on the bonds of
  the substrate.
  d. always work on their own.
  e. do all of these.

Question 2

Which of the following is NOT true of enzyme
  behavior?
  a. Enzyme shape may change during catalysis.
  b. The active site of an enzyme orients its
  substrate molecules, thereby promoting
  interaction of their reactive parts.
  c. All enzymes have an active site where
  substrates are temporarily bound.
  d. Each enzyme can catalyze only a specific
  reaction.
  e. Enzyme activity is not affected by pH and
  temperature.