they are made up of c, h and o atoms

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LIPIDS. They are made up of C, H and O atoms. In lipids the number of H atoms is more than the number of O atoms. This is the reason why lipids give more energy. Lipids are found in all cells. - PowerPoint PPT Presentation

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  • In lipids the number of H atoms is more than the number of O atoms. This is the reason why lipids give more energy.

    They are made up of C, H and O atoms. LIPIDSLipids are found in all cells.They are insoluble in water but soluble in non-polar organic solvents such as ether, chloroform, benzene.Sometimes P and N atoms can join the lipid structure.

  • LIPIDSSTEROIDSPHOSPHOLIPIDSGLYCOLIPIDSNEUTRAL LIPIDS (Triglyceride)The structural units of lipids are glycerol and fatty acids. The type and function of the lipid molecule differs due to the type of fatty acid.

  • Glycerol + 3 fatty acidsTriglyceride + 3 H2O3ATP

    GLYCEROL

    OOOH HOH HOH HOfatty acidsfatty acidsfatty acids3 ATPenzyme

    GLYCEROL

    __ O____ O____ O__fatty acidsfatty acidsfatty acids+3H2Oester linkage@enzymeA) Triglycerides (Neutral Lipids)

  • GLYCEROL: is an alcohol that has three OH (hydroxide groups)FATTY ACIDS: are long chains of H and C atoms. At the end of the chain, there is carboxyl (- COOH) group.A) Triglycerides (Neutral Lipids)

  • FATTY ACIDSUnsaturated Fatty AcidsSaturated Fatty Acids solid at room temperature only single C-C bonds occurex: butter, lard liquid at room temperature one or more double bonds between C atomsex: olive oil, peanut oil, corn oil,sunflower oil

  • B) Phospholipids Found in the cell membrane structure The third fatty acid of fat molecule is replaced by phosphate group.They have hydrophilic (loves-water) and hydrophobic (hates water)Hydrophilic (polar because of PO4-3)Hydrophobic (non-polar)

  • B) Phospholipids

  • B) Phospholipids

  • B) Glycolipids Found in the cell membrane structure of neurons The third fatty acid of fat molecule is replaced by a glucose or galactose molecule.

  • B) Steroids They are important in membrane structure and in metabolism. They all have the same backbone made up of carbon rings. They are lipids without fatty acids.

  • IMPORTANCE OF LIPIDS Lipids are great energy sources. They store twice the energy of carbohydrates because they have more H atoms in their structure. Lipids are used as structural units of cell structure. Lipids are stored in animal body, under the skin and around the organs. This helps protect the body from mechanical effects and is a long-term energy storage. Also this helps in heat isolation.

  • Lipids are solvent for A, D, E and K vitamins, so these vitamins can be stored in the body. Because they include more H atoms than carbohydrates, they result in production of more water molecules when used in aerobic respiration. This provides animals living in dry environments with water.IMPORTANCE OF LIPIDS

  • It is thought that fats (saturated fatty acids) increase the level of cholesterol in the blood. High blood cholesterol levels may be linked to atherosclerosis and other heart diseases. IMPORTANCE OF LIPIDS

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