Kindly Scroll down for the complete pdf lecture of biochemistry. What is Biochemistry? Biochemistry is the study of chemical substances and vital processes occurring in living organisms. It focuses on the structure and function of cellular components such as proteins, carbohydrates, lipids, nucleic acids, and other biomolecules. Essentially, biochemistry is the game of enzymes—biological catalysts that speed up chemical reactions in the body. Key Topics in Biochemistry 1. Enzymes: The Catalysts of Life Enzymes are proteins that act as biological catalysts, speeding up chemical reactions without being consumed in the process. They are crucial for digestion, energy production, and countless other bodily functions. For example, Pyruvate Dehydrogenase is an enzyme complex that plays a vital role in converting pyruvate into acetyl-CoA, a key step in cellular respiration. Enzyme Deficiency Disorders Pyruvate Dehydrogenase Deficiency : A recessive disorder common in children, leadi...