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Carbohydrates, Protein, Lipids, and Dna Join now to read essay Carbohydrates, Protein, Lipids, and Dna Carbohydrates have two major functions in plants and animals: they serve as fuel and building material. Plants store most of their energy in the form of starch. Starch is a polysaccharide (consisting of several conjoined sugars). Synthesizing starch enables the.