Final answer:
Lipids offer the highest energy yield per mass among macromolecules due to their efficient energy storage properties.
Explanation:
Lipids provide the highest amount of energy per mass compared to other macromolecules like carbohydrates, nucleic acids, and proteins. Lipids are efficient energy storage molecules due to their high energy content per gram. For example, fats, a type of lipid, provide around 9 calories per gram, whereas carbohydrates and proteins provide 4 calories per gram.
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