Final answer:
Adenylyl cyclase converts ATP to cyclic AMP (cAMP), which acts as a second messenger in cellular signaling. Cyclic AMP activates CAMP-dependent kinase (A-kinase) to regulate metabolic pathways in cells.
Step-by-step explanation:
Adenylyl cyclase is an enzyme that converts ATP to cyclic AMP (cAMP), which acts as a second messenger in cellular signaling pathways. Cyclic AMP, on the other hand, binds to and activates an enzyme called CAMP-dependent kinase (A-kinase), which regulates various metabolic pathways in cells by phosphorylating target proteins. Both adenylyl cyclase and cyclic AMP play important roles in cellular signaling and the regulation of cellular processes.