Biosynthesis is the cellular construction process: converting substrates into more complex products. In this context, a substrate is the material upon which enzymes act to create a bioproduct. Common biosynthetic products include carbohydrates, proteins, vitamins, and lipids.
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Biosynthesis and anabolism seem to be synonyms. Conceptually they are, but anabolism is most often used to refer to metabolic pathways: series of chemical reactions within a cell.