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Slide 1

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TRIGLYCERIDES
· One glycerol molecule with three fatty acids
· Fatty acids have long hydrocarbon tails
· The tails are hydrophobic, making triglycerides
insoluble in water
· Used as energy storage molecules
· The hydrocarbon tails release a lot of energy
when they are broken down
· Form insoluble droplets, the fatty acids facing
inwards. Don't affect osmosis…read more

Slide 2

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PHOSPHOLIPIDS
· One phosphate molecule or `group' attached
to a glycerol molecule with two fatty acids
· Phosphate group is hydrophilic
· Fatty acids are hydrophobic
· Make up a phospholipid bilayer in cell
membranes
· Acts as a barrier to water-soluble substances…read more

Slide 3

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CHOLESTEROL
· Has a hydroxyl (HO) group attached to
hydrocarbon rings attached to a hydrocarbon
tail
· The hydroxyl group makes it soluble
· Its small size and flattened shape means it can
fit in between the fatty acid tails in the cell
membrane bilayer
· This causes them to pack closer together
making the membrane more rigid.…read more

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