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Cholesterol

lipid biofact sheet

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B io F actsheet April 1999 Number 42 1 The Structure and Function of Lipids All lipids are polymers ? long chains of repeating units joined together in a condensation reaction during which water is released. The commonest lipids are triglycerides ? three fatty acids and glycerol linked by an ester bond (Fig 1). This Factsheet summarises the structure and function of lipids. Lipids are organic compounds found in every type of plant and animal cell. They always contain the elements carbon, hydrogen and oxygen, but the reletive amount of oxygen is less than in carbohydrates. cells in plant roots forces water into the symplast pathway which is under the control of the nucleus. This strip therefore gives the plant control over substances entering the xylem. 7. Buoyancy

Proteins and Lipids

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LIPIDS & MEMBRANE STRUCTURE Lipids differ from the other macromolecules: not formed by linear polymerization however, they do have a high molecular weight they contribute to important cellular structures (membranes) What are they? Heterogeneous category of cellular components that are insoluble in water (hydrophobic) Lipids are typically rich in nonpolar hydrocarbon regions with relatively few polar groups Lipids have 3 main cellular functions: 1. Energy storage (fat to sugar) Lipids have about 6 times more energy than the same weight of a polysaccharide 2. Membrane structure 3. Transmission of chemical signals There are six main classes of lipids (FAMILIARIZE WITH THE FIRST 3) Fatty acids are the building blocks for several other kinds of lipids
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