By: Brian Nguyen and Vincent Lin


Fatty acid is one of the monomer of lipids, along with the glycerol. The drawing below is of a fatty acid and glycerol, respectively.
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Triglyceride is the polymer of glycerol and fatty acid. The picture below is the polymer.
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Examples of lipids

  • Fats: Saturated, Unsaturated, Trans fat (e.g. Milk, cheese, olive oil, canola oil, potato chips, cookies, salmon)

  • Steroids: cholesterol, estrogen, testosterone, bile salt, cortisol
  • Waxes: ear wax, bee wax

Functional Groups of Lipids

Ester (Made of Carboxyl and Hydroxyl) for certain groups like Wax or Glyceride.

Carboxyl and hydroxyl separately are also present in lipids.

Common Function of Lipids

  • Lipid is used for energy storage.
  • Provides energy when there is none.
  • Protects inner organs.
  • Insulates, and keeps you warm.
  • Fat soluble vitamins A,D,E, and K.
  • Helps build up cell membranes and hormones.

Structure and Function of Lipid

Lipids have a hydrophobic tail, made of hydrocarbon, and has a hydrophilic head made of carboxyl. When you put them together, they are not soluble with water. By doing so, the lipid is able to be stored and used when the time comes.


Christie, William W. "The AOCS Lipid Library." Lipids, Fatty Acids, Structure, Composition, Biochemistry and Function. James Hutton Institute, n.d. Web. 15 Sept. 2014. <>.

Gauthier, Nicholas. "Monomers: Types, Examples & Quiz." Education Portal. N.p., n.d. Web. 16 Sept. 2014. <>.

Gregory, Michael J., Ph.D. "Organic Chemistry, Biochemistry." Biology Web. N.p., n.d. Web. 16 Sept. 2014. <>.

"How Does the Body Use Lipids?" LIVESTRONG.COM. LIVESTRONG.COM, 05 Mar. 2014. Web. 15 Sept. 2014. <>.