Which of the Following Are Examples of Amplification of a Hormone

Multiple Choice

Which of the following are examples of amplification of a hormone signal?
I. Epinephrine initiates an enzyme cascade.
II. Steroids bind hormone-response elements in the cell and initiate transcription of many genes.
III. A quantity of 0.09 mg of growth hormone leads to a 10,000-mg weight gain in a cow.
IV. Different cell types have different receptors capable of binding the same hormone.

A) only I and III
B) only II and IV
C) only I, II, and III
D) only II and III
E) I, II, III, and IV