LQB186 Lecture Notes - Lecture 2: Lipid Bilayer, Monounsaturated Fat, Exocytosis

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Lipids are biological molecules characterized by limited solubility in water and solubility in non-polar organic solvents: hydrophobic molecules. Lipids are organic molecules basic lipids contain carbon, hydrogen and sometimes oxygen. Lipids can serve a diverse range of functions within a cell, including: Storage of energy for long-term use (e. g. triglycerides) Hormonal roles (e. g. steroids such as oestrogen and testosterone) Insulation both thermal (triglycerides) and electrical (sphingolipids) Protection of internal organs (e. g. triglycerides and waxes) Structural components of cells (e. g. phospholipids and cholesterol) Triglycerides function as a long-term energy source in animals (fats) and plants (oils) Form of lipid that is used by the cell. Steroids act as hormones in plants and animals, and is a structural component of animal cell membranes (cholesterol: waxes act as a protective layer against water loss in plant leaves and animal skin. Carotenoids light-absorbing accessory pigment in plants (involved in photosynthesis) Waxes esters of fatty acids and long chain alcohols.

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