What elements do lipids contain?

Lipids contain the elements carbon, hydrogen and oxygen.

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Are lipids considered polymers?

No, lipids are not made up of long chains of monomers and are not considered polymers.

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What are the roles of lipids?

  1. Energy supply
  2. Structural components
  3. Waterproofing
  4. Insulation
  5. Protection

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What are phospholipids used for?

Phospholipids are used in cell membranes as structural components.

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What are most lipids made up of?

Most lipids are made up of fatty acids combined with an alcohol, usually glycerol.

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Describe the structure of a fatty acid.

A fatty acid consists of a carboxyl group (-COOH) attached to a hydrocarbon chain (R group).

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What is a saturated fatty acid?

A saturated fatty acid has a hydrocarbon chain saturated with hydrogen, with no carbon-carbon double bonds.

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What is an unsaturated fatty acid?

An unsaturated fatty acid has a hydrocarbon chain with at least one carbon-carbon double bond, causing the chain to kink.

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What is the difference between monounsaturated and polyunsaturated fatty acids?

Monounsaturated fatty acids have 1 carbon-carbon double bond, while polyunsaturated fatty acids have 2 or more carbon-carbon double bonds.

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How can you test for lipids?

Perform the emulsion test:

  1. Place sample in a test tube.
  2. Add ethanol.
  3. Shake.
  4. Add distilled water.
  5. A milky-white emulsion forms if lipids are present.

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