Which of the following statements is true of the proteobacteria?

Which of the following statements is true of the
  proteobacteria?
  a. They are the largest group of bacteria.
  b. Some are photoautotrophs.
  c. Some are chemoautotrophs.
  d. Some are chemoheterotrophs.
  e. All of these are true.

Question 2

Which of the following is NOT true about
  cyanobacteria?
  a. Cyanobacteria have the same light-capturing
  chlorophylls as plants.
  b. Chloroplasts evolved from ancient
  cyanobacteria.
  c. Cyanobacteria can fix carbon.
  d. Cyanobacteria can fix nitrogen.
  e. Cyanobacteria put nearly all of the nitrogen into
  Earths atmosphere.