Which of the following statements best describes the role signaling pathway? adenylyl cyclase the epinephrine It converts polymer to its monomer subunits. move5 sudstances acruss the plasma membrane_ It accelerates the production of second messenger- It transfers phosphate groups from ATP protein substrates certain signal transduction pathway, the binding of an extracellular molecule to cell-surface protein results in rapid increase the concentration cyclic AMP inside the cell The cyclic AMP binds and activates cytosolic enzymes that then activate other enzymes ne celll Which of te following statements best describes the role of cyclic AMP in the signal transduction pathway? acts a8 signaling molecule that passes the signal from the cell to other cells It acts a8 eceptor that carries the signal from outside the cell to inside the cell. It acts a8 second messenger that helps relay and amplify the signal within the cell: It acts 38 channel protein iat ransmits the signal across the cell s nuclear membrane.