12: Lipids

Students classify lipids by type (fatty acids, triacylglycerols, sphingolipids, steroids, waxes), identify lipid structures from molecular formulas, and distinguish saturated from unsaturated fatty acids.

LibreTexts reference: Unit 3, Chapter 3: Lipids

Omega Notation for Fatty Acids

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\/\/^═\/^═\/\‗/\/^═\_COOH

What is the correct ω (omega) notation for the 18 carbon fatty acid pictured above?

• A.

  ω–1,2,3,4

• B.

  ω–8,10,13,16

• C.

  ω–2,6,10,13

• D.

  ω–5,8,12,16

• E.

  ω–5,8,11,13

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Fatty Acid Chain Length and Number of Double Bonds

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The notation 22:3 indicates which of the following about a fatty acid?

• A. There are 22 carbons in the chain with 3 double bond(s).
• B. There are 22 carbons in the chain and the 3rd carbon has a double bond.
• C. The 22nd carbon in the fatty acid has 3 double bond(s).
• D. The 3rd and 22nd carbons in the fatty acid chain have double bonds.
• E. There are three 22-carbon chains in this lipid molecule.

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Lipids by Molecular Formula

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Based on only their molecular formula, which one of the following compounds is most likely a lipid?

• A. C₂₇H₄₄N₃O₂₃P
• B. C₁₄H₂₁N₆O₉P
• C. C₁₄H₁₇N₈O₇P
• D. C₆₄H₁₁₂O₉NP
• E. C₇H₁₂N₂O₅

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