The sodium-potassium pump within living cells requires energy to move ions across the cell membrane to maintain homeostasis. how is this energy supplied? a when adenine is removed from adenosine triphosphate (atp), a large amount of energy is produced. b when two adenosine triphosphate (atp) molecules are fused together, a large amount of energy is produced. c when a phosphate group is removed from adenosine triphosphate (atp), a large amount of energy is produced. d when the sugar and phosphate groups of adenosine triphosphate (atp) are fused together, a large amount of energy is produced.