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Carbohydrates would be the most useful biological macromolecule for running a marathon as they provide a quick source of energy to fuel the muscles during endurance activities. Consuming complex carbohydrates before the race can help store glycogen in the muscles for sustained energy, while simple carbohydrates during the race can provide immediate energy.

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11mo ago
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Q: What biological macromolecule would be useful if you were running a marathon?
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