Which of the following statements is true?

Which of the following statements is true?
  a. Although hormones are carried to all parts of the body, they produce effects only in cells
  with proper receptors.
  b. Hormones are limited to steroid compounds.
  c. Hormones are secreted by specialized exocrine glands.
  d. Most hormones are controlled by positive feedback mechanisms involving the pituitary
  gland.
  e. Hormones are supplied to the body in the diet.

Question 2

Knowledge TOP: THE ENDOCRINE SYSTEM: HORMONES
  6. Target cells
  a. are found only in specific endocrine glands.
  b. are equipped with specific receptor molecules.
  c. are muscle cells.
  d. may occur in any part of the body.
  e. are equipped with specific receptor molecules and may occur in any part of the body.