Lipids are a diverse group of hydrophobic organic molecules essential for energy storage, cell membrane structure, and signaling. They are classified into fats, phospholipids, steroids, and waxes, each serving distinct biological functions. Lipids are composed mainly of carbon, hydrogen, and oxygen, with some containing phosphorus or nitrogen. They are synthesized in the body and obtained from dietary sources. Their structural role in membranes (phospholipids), hormonal functions (steroids), and energy storage (triglycerides) make them vital for cellular processes and overall metabolism.
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