Final answer:
ATP is better than glucose or fatty acids as an immediate energy source for cell metabolism because it provides a rapid and direct source of energy for cellular processes. Glucose and fatty acids are more efficient energy sources compared to ATP, but ATP releases free energy when its phosphate bonds are broken, supplying ready energy to the cell.
Step-by-step explanation:
ATP is better than either glucose or fatty acids as an immediate energy source for cell metabolism because ATP provides a rapid and direct source of energy for cellular processes. Glucose and fatty acids are more efficient energy sources compared to ATP, but they take longer to be converted into usable energy. ATP releases free energy when its phosphate bonds are broken, supplying ready energy to the cell.