Which macromolecule is not primarily eaten for energy?

Which macromolecule is not primarily eaten for energy?

• A. Lipids
• B. Carbohydrates
• C. Nucleic Acids
• D. Proteins

Answer: (D)

Energy in the body comes mainly from carbohydrates and fats. Carbohydrates provide quick glucose for immediate energy, while fats offer a large, efficient energy reserve for longer-term needs. Proteins, on the other hand, are mainly used as building blocks for tissues, enzymes, hormones, and other critical functions. If energy is desperately needed, amino acids from proteins can be converted into energy pathways, but this use sacrifices valuable proteins that the body relies on for structure and function. Nucleic acids aren’t used for energy at all in normal metabolism; they store and transmit genetic information. So the macromolecule not primarily eaten for energy is proteins.

Energy in the body comes mainly from carbohydrates and fats. Carbohydrates provide quick glucose for immediate energy, while fats offer a large, efficient energy reserve for longer-term needs. Proteins, on the other hand, are mainly used as building blocks for tissues, enzymes, hormones, and other critical functions. If energy is desperately needed, amino acids from proteins can be converted into energy pathways, but this use sacrifices valuable proteins that the body relies on for structure and function. Nucleic acids aren’t used for energy at all in normal metabolism; they store and transmit genetic information. So the macromolecule not primarily eaten for energy is proteins.