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