Energy-yielding nutrients store energy in their chemical bonds. In order for cells to convert that stored energy into ATP, the nutrients must be transformed through the activity of

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Catabolic pathways, such as glycolysis and the citric acid cycle, break down energy-yielding nutrients into smaller molecules that can be used to generate ATP. Digestion and absorption are involved in the uptake of nutrients, but do not directly convert them into ATP. Anabolic pathways build larger molecules, such as proteins and nucleic acids, and generally require energy input rather than release.

Energy-Yielding Nutrients Store Energy in Their Chemical Bonds