Energy-yielding Cell nutrients macromolecules Carbohydrates Proteins Fats Polysaccharides Proteins Lipids Nucleic acids ADP HPOZ NAD The energy supply NADP and demand in Catabolism Anabolism ATP NADH NADPH Heterotrophs Chemical energy the ATP-ADP cycle Energy.poor Precursor end products molecules Amino acids Sugars Fatty acids Nitrogenous aseThe energy supply and demand in Heterotrophs: the ATP-ADP cycle