In a biological reaction involving an enzyme, the active site of an enzyme binds to .

A. the substrate

B. the catalyst

C. the active site of another enzyme

D. the inactive site of another enzyme

What happens as electrons move along the chain of molecules known as the electron transport chain? they gain energy, which causes atp molecules to lose phosphate groups. they gain energy, which causes h *ions to join with oxygen to produce water. they lose energy, which is then used by the cell to make atp. they lose energy, which is then used to break down atp.