Lipids

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Lipids

  1. 1. Lipids 1. Fats 2. Phospholipids 3. steroids -nonpolar (hydrophobic)‏ -insoluble (can’t dissolve) in water and other polar substances
  2. 3. 3 Major Groups: Triglycerides (fats) – glycerol molecule linked to 3 fatty acid chains Note that the fatty acid chains are made up of long chains of hydrocarbons with a carboxyl group at one end
  3. 4. Triglycerides can be saturated, monounsaturated, or polyunsaturated Saturated – maximum# of H added to C backbone - solid at room temperature
  4. 5. Monounsaturated – one double bonded carbon in chain - liquid at room temperature
  5. 6. Polyunsaturated – two or more double bonded carbons in chain -liquid at room temperature
  6. 7. 2. Phospholipids -one fatty acid chain is replaced by a phosphate group (+R)‏ -hydrophobic end and hydrophilic end
  7. 8. 3. Steriods -backbone of 4 interconnected carbon rings (3 hexose, 1 pentose)‏
  8. 9. Biologically Important Steroids Cholesterol – component of cell membrane (controls fluidity)‏ - starting ingredient for synthesis steroid hormones Difference between Good (HDL) and Bad (LDL) Cholesterol
  9. 10. Estradiol – female sex hormone
  10. 11. Testosterone – male hormone

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