Biochemistry is the study of life on the chemical level. A large portion of it is focused on metabolic patways (glycolysis, krebs cycle, electron transport chain, beta oxidation, lipid synthesis, urea cycle, amino acid biosynthesis, gluconeogenesis, etc...). There is also overlap with molecular biology, so you will probably learn a lot about DNA, transcription and translation, gene expression, etc.
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the study of how lifes mechanisms work