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Each of the four major biological macromolecules contains nutritional value and can also fulfill caloric needs. Nucleic acid intake is important; however, humans only consume 2-10 grams of nucleic acids per day, ​so the other three macromolecules are a better source of calories.

That being said, fatty acids are a good source of calories when metabolized and produce
Select Option 9 kcals4 kcals2 kcals
per gram, proteins
Select Option 9 kcals4 kcals2 kcals
per gram, and carbohydrates
Select Option 9 kcals4 kcals2 kcals
per gram.
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