Lipids

• Describe the structure of a triglycerid

  A triglyceride is a glycerol molecule joined to 3 fatty acids using a condensation reaction, making 3 ester bonds.
• describe the structure of a phospholipid

  A phospholipid is a glycerol molecule joined to 2 fatty acids and an inorganic phosphate group using condensation reactions, make 3 ester bonds. The molecule has a non-polar tail that is hydrophobic and a polar head that is hydrophilic.
• describe an unsaturated fatty acid

  A hydrocarbon chain that has one or more double bonds between the carbon atoms.
• give the properties of triglyceride

  It is a large non-polar molecule that is insoluble in water. It does not affect the water potential of the cell.
• give the properties of a phospholipid

  It is a large molecule that has a hydrophobic tail (non-polar) and a hydrophilic head (polar) due to the inorganic phosphate. It forms a bilayer in water.
• explain why the hydrolysis of lipids will reduce the PH of a solution

  fatty acids are released that are acidic
• what is the biochemical test for a lipid

  Add ethanol to the test solution and shake. Then add water to the solution and shake. If there is a white emulsion a lipid is present.
• how are fatty acids important in the formation of a new cells

  Fatty acids used to make phospholipids; Phospholipids in membranes; More phospholipids more membranes made;

  Fatty acids respired to release energy; More triglycerides more energy released; Energy used for cell production / production of named cell component;