• A lipid is an organic compound such as fat or oil.
  • Organisms use lipids to store energy, but lipids have other important roles as well.
  • Lipids consist of repeating units called fatty acids.
  • Fatty acids are organic compounds that have the general formula CH3(CH2)nCOOH.
  • There are two types of fatty acids: saturated fatty acids and unsaturated fatty acid.
  • Unsaturated fatty acids have bent chains, like all the other fatty acids in the figure.
  • Excess dietary lipids can be harmful because they are high in energy.
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