Fatty Acids - TRIACYLGLYCEROLS (Fig.4) , or fats, which...

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Fatty Acids -simplest lipids. (Fig. 1) Fatty acids consist of long hydrocarbon chains, most frequently containing 16 or 18 carbon atoms, with a carboxyl group at one end. UNSATURATED fatty acids contain one or more double bonds between carbon atoms (Fig. 1) In SATURATED fatty acids all of the carbon atoms are bonded to the maximum number of hydrogen atoms. (Fig. 1) The long hydrocarbon chains of fatty acids contain only nonpolar C-H bonds, which are unable to interact with water. The hydrophobic nature of these fatty acid chains is responsible for much of the behavior of complex lipids, particularly in the formation of biological membranes. The hydrophillic heads (carboxyl group) gives fatty acids a dual nature referred to as amphiphatic . Fatty acids are stored in the form of
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Unformatted text preview: TRIACYLGLYCEROLS (Fig.4) , or fats, which consist of three fatty acids linked to a glycerol molecule (Fig. 2) . These molecules are insoluble in water and therefore accumulate as fat droplets in the cytoplasm. When required, they can be broken down for use in energy-yielding reactions. Fats are actually a more efficient form of energy than carbohydrates, yielding more than twice as much energy per weight of material broken down. Well over 100 different kinds of fatty acids have been isolated from various lipids of animals, plants, and microorganisms. Bacteria contain fewer and simpler types of fatty acids than higher organisms -- fatty acids with more than one double bond have not been found in bacteria....
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This document was uploaded on 11/03/2011 for the course BIOLOGY MCB2010 at Broward College.

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