Large molecules by 0ww0RNy

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									C7. & C8. NEUTRAL FATS, STEROIDS & PHOSPHOLIPIDS

       - Large molecules, insoluble in water
                     - long term storage for energy
                     - vegetable oils, animal fats etc.
                     - most efficient form of storing energy

STRUCTURE:            - A glycerol (3 Carbon) backbone with 3 Fatty Acids attached.
                      This is a Neutral Fat or a Triglyceride
 Glycerol




Phospholipids - the third fatty acid group is replaced by a phosphorous group
              C

              C                      O

              C       OH     HO      P      OH

                                     OH

       - This makes the phospholipid molecule polar
       - it can dissolve in water
       - Phosphorous head is hydrophylic (loves water) and the fatty acid tails are
          hydrophobic (hate water)
                     Cell Membrane
              C

              C
                                                          2 Fatty acids (Hydrophobic)
              C
       P
 Phosphorous group (Hydrophylic)

Saturated and Unsaturated Fats:

       Saturated:
             - all Carbon atoms have 2 Hydrogen atoms
             - makes it a solid at room temperature
             - lard, butter, animal fats

              HHHHHH
              C-C-C-C-C-C-H
              HHHHHH

       Unsaturated:
             - Not all Carbon atoms have 2 Hydrogen atoms attached
             - makes them a liquid at room temperature
             - olive oil, corn oil, palm oil etc.

              H   HH       H H
              C-C=C-C-C=C=C-C-H
              H H H H        H

       Polyunsaturated:
             - Many double bonds
             - fewer hydrogens

Steroids:     4 Carbon rings (5 or 6 carbons) in each ring fused together
                     - related to cholesterol (made from cell membranes)
                     - used as sex hormones (Testosterone, Estrogen, Progesterone)
                     - fat soluble

								
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