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Across the spectrum of living things on Earth, the same four macromolecules are found: proteins, carbohydrates, lipids, and nucleic acids. Each of these macromolecules plays an important role in the well-being of an organism. Biochemistry is the study of the chemical processes in living organisms, including reactions that involve these macromolecules. Carbohydrates provide energy and structure. Proteins catalyze chemical reactions that are vital to sustaining life. Lipids form the basis of cell membranes and nutrient molecules, as well as fats. DNA and RNA, the nucleic acids, contain and express the information necessary to create proteins required to carry out an organism's life processes.

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