Lipids

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What are the main groups of lipids?
Triglycerides (fats+oils; phospholipids & waxes.
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What do phospholipids allow membranes to be?
Flexible and to transfer substances
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Name 4 roles of lipids?
Insulation; Protection; Waterproofing; Energy source.
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Name some characteristics of a lipid?
Insoluble, but soluble in organic solvents; contain carbon, hydrogen & O2; proportion of O2 to carbon & hydrogen smaller than in carbs.
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What is the structure of the triglyceride?
3 fatty acids & 1 glycerol molecule
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What does each fatty acid form with glycerol?
An ester bond through a condensation reaction.
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What group do all fatty acids have and what is attached to it?
A carboxyl group with a hydrocarbon chain
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What is the fatty acid considered as if the hydrocarbon chain has no carbon-carbon double bonds?
Saturated
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What is the fatty acid if the hydrocarbon chain has a double single carbon bond?
Mono-unsaturated
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What is the fatty acid if the hydrocarbon chain has more than one double carbon bond?
Polyunsaturated
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In the structure of a phospholipid, what is one of the fatty acids replaced by?
A phosphate molecule.
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In the structure of a phospholipid, what are fatty acid molecules?
Hydrophobic
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In the structure of phospholipids, what are the phosphate molecules?
Hydrophilic
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What are phospholipids made up of?
Hydrophilic heads & hydrophobic tails
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What do hydrophilic heads do?
Move towards the water in the cell (point inwards the cell).
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What do hydrophobic tails do?
Move away from water (point outwards the cell).
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What is the test for lipids?
The emulsion test.
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In the emulsion test, what solution is added to the sample of lipids?
Ethanol
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What colour will form if a lipid is present?
Cloudy-white
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Other cards in this set

Card 2

Front

What do phospholipids allow membranes to be?

Back

Flexible and to transfer substances

Card 3

Front

Name 4 roles of lipids?

Back

Preview of the front of card 3

Card 4

Front

Name some characteristics of a lipid?

Back

Preview of the front of card 4

Card 5

Front

What is the structure of the triglyceride?

Back

Preview of the front of card 5
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