Which of the following statements is true of metabolic pathways?

Which of the following statements is true of
  metabolic pathways?
  a. They are enzyme-mediated sequences of
  reactions.
  b. They may be biosynthetic or degradative.
  c. Photosynthesis is a biosynthetic pathway.
  d. Catabolism is a degradative pathway.
  e. All of these are true.

Question 2

In some cases, inhibitors or activators of enzymecatalyzed
  reactions act by
  a. binding to the substrates.
  b. affecting the supply of ATP.
  c. reversibly binding to an enzymes allosteric site.
  d. reducing or increasing the concentration of
  enzymes.
  e. binding to the products.