1.3 Lipids

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6 Terms

1
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Test for lipids

  1. Add ethanol, shake (to dissolve lipids), then add water.

  2. Positive result = milky white emulsion


2
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Two types of lipids

  • Phospholipids

  • Triglycerides


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Unsaturated fatty acids

Have one or more C=C double bond in hydrocarbon chain (creating a bend / kink)

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Saturated fatty acids

No C=C double bonds in hydrocarbon chain, so all the carbons are fully saturated with hydrogen.

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Function of triglycerides

Energy storage

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Function of phospholipids

forms a bilayer in cell membrane, allowing diffusion of lipid-soluble (non polar) or very small substances and restricting movement of water soluble (polar) or larger substances