Answer
X is cAMP; its production is stimulated by epinephrin.
$(a)$ Centrifugation sediments adenylyl cyclase (which catalyzes cAMP formation) in the particulate fraction.
$(b)$ Added cAMP stimulates glycogen phosphorylase.
$(c)$ cAMP is heat stable; it can be prepared by treating ATP with Barium hydroxide.
Work Step by Step
We have learned in this chapter about hormone action, and interpreted each of the experiments described.
