Lipids

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  • Created by: AminA1000
  • Created on: 26-10-18 16:03
Name two types of lipid
triglyceride and phospholipid
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how are triglycerides formed
condensation of one molecule of glycerol and 3 fatty acids
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Why are lipids insoluble in water
hydrophobic fatty acid tail
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how can a fatty acid be shown
RCOOH
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what is the R group
a variable hydrocarbon chain which can either be saturated or unsaturated
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what is a saturated fatty acid
single bonds only in the hydrocarbon chain
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what is an unsaturated fatty acid
one or more double carbon bond in the hydrocarbon chain
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Test for lipids
Emulsion test. Add ethanol, to sample shake. THEN add water, shake - if lipids are present a WHITE EMULSION forms
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how is a triglyceride different to a phospholipid
In a phospholipid, one fatty acid is replaced by a phosphate group,
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how do phospholipids form a bilayer in water ?
hydrophilic phosphate head which attracts water, and hydrophobic fatty acid tail which repel water
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How are the structures of triglycerides useful
contains lots of stored chemical energy = used as an energy storage molecule, hydrophobic fatty acid tails= insoluble in water - does not affect WP& will not dissolve energy
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how are the structures of phospholipids useful
Hydrophobic fatty acid tails and hydrophilic heads- form phospholipid bilayer- USEFUL= forms cell membranes , also hydrophobic faty acid centre means that water soluble molecules cannot easily pass through the membrane
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Other uses of lipids in the body
storage for membranes, hormones such as testosterone, respiratory substances
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Other cards in this set

Card 2

Front

how are triglycerides formed

Back

condensation of one molecule of glycerol and 3 fatty acids

Card 3

Front

Why are lipids insoluble in water

Back

Preview of the front of card 3

Card 4

Front

how can a fatty acid be shown

Back

Preview of the front of card 4

Card 5

Front

what is the R group

Back

Preview of the front of card 5
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