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20 March, 14:23

Protein molecules differ from carbohydrate or fat molecules by the addition of this element.

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  1. 20 March, 14:32
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    Nitrogen

    Explanation:

    The molecules of fats and carbohydrates contain mainly C, H, and O.

    Proteins consist of long chains of amino acids, which contain NH₂ groups.

    Thus, proteins contain C, H, O, and N.

    The additional element is nitrogen.
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