Basics of Biology

Molecules and Biology

What are the most common macromolecules used as energy sources by cells?

Cells use a variety of macromolecules as energy sources. Carbohydrates, lipids, and even proteins can be metabolized for energy; ATP and related compounds are also used for temporary energy storage. (For more about cells, see the chapter “Cellular Basics”; for more about the various human energy sources for cells, see the chapter “Biology and You.”)


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