• also known as
    • glycerine
    • glycerol
  • the backbone of
    • triglycerides
    • phospholipids


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a 3 carbon sugar backbone

  • Each of the 3 carbons can attach to other molecules
  • If all three carbons attach to a fatty acid it is a triblyceride


Fatty acid





- 3 glycerol carbons attached to 3 separate fatty acids

  • Triglycerides are independent from further attachments
  • Independent triglycerides freely float through blood and tissues to cause harm


- composed of a 3 carbon glycerol, 2 fatty acids, a phosphate group, and a polar molecule

  • A phospholipids is an enhanced  triglycerides
  • triglycerides are stand alone
  • phospholipids are intertwined in membranes


- a 3 carbon amino acid, similar to glycerol

  • Each of the 3 carbons can attach to other molecules


- serine replaces the glycerol as the backbone 3 carbon chain

  • critical component of myelin sheaths around nerves
  • myelin allows nerves to side ways communicate
  • essential for thought
  • opposed to sensory nerves that cannot 'think'


- segment backbones of 3 carbon chains, either

  • glycerol, sugar
  • serine, amine

- triglycerides are independent

  • glycerol backbone
  • 3 fatty acids

- phospholipids

one fatty acid, is replaced with a phospho group

complex and interconnect
- 2 types of phospholipids

  1. glycerol backbone,
    • sugar
    • phospholipid
      • cell wall
      • membranes
  2. serine backbone,
    • amino acid
    • sphingomyelin
      • myelin sheaths
      • nerve membranes

- both types expand larger than a triglyceride through phosphorus bonding


Cell walls


The phospholipids are important components of all cell membranes, internal and external.

The lipid that forms the framework of the cell membrane are phospholipids.

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The ratio of hydrogen and oxygen are always the same as water in a carbohydrate.

In a lipid the hydrogen to oxygen ratios are not the same as water, hydrate as in carbohydrate.