This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Enzymes, Subject name: Biochemistry
Adenylate cyclase conves 
Select and explain. 
A. ATP to ADP, B. ADP to ATP, C. ATP to cAMP, D. AMP to ADP
C: ATP to cAMP
Answer: C: ATP to cAMP 
Explanation: Adenylate cyclase (calmodulin-sensitive) trimer, Bacillus anthracis Epinephrine binds its receptor, that associates with a heterotrimeric G protein. The G protein associates with adenylyl cyclase, which conves ATP to cAMP, spreading the signs