The electron transport chain forms a concentration gradient for H+, which diffuses through ATP ...

The electron transport chain forms a concentration gradient for H+, which diffuses through ATP synthase complexes,
  producing ____.
  a. ATP
  b. FAD
  c. G3P
  d. NADH
  e. pyruvate

Question 2

Which of the following statements about the electron transport chain is true?
  a. Protons are pumped out of the mitochondria by the complexes of the electron transport chain.
  b. The proton gradient established during electron transport is a form of potential energy.
  c. The electron transport chain can be found in the mitochondria of aerobic bacteria and other cells.
  d. The movement of protons down a concentration gradient is an endergonic process.
  e. ATP synthesis associated with the electron transport chain is an example of substrate level phosphorylation.