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Biochemistry is the study of the chemical processes and substances that occur within living organisms. It bridges the gap between chemistry, physics, and medicine, exploring how biological systems function at the molecular level. Biochemistry investigates the structures, functions, and interactions of biological macromolecules such as proteins, nucleic acids, lipids, and carbohydrates, providing insights into their roles in various cellular processes like metabolism, signal transduction, and gene expression. By elucidating these mechanisms, biochemistry contributes significantly to our understanding of human health and disease, leading to advancements in diagnostics, therapeutics, and genetic engineering.