In most organisms, ___________ macromolecules play a central role as the energy source. This macromolecule must be transformed in the body to produce the usable energy molecule ______. Interestingly, this energy molecule is a _________ type of macromolecule.
A
carbohydrate, adenosine triphosphate, nucleic acid
B
lipid, atropine tetraphosphate, protein
C
protein, adenosine triphosphate, lipid
D
carbohydrate, atropine triphosphate, protein