Biological molecules AQA AS Biology PART 2 of 8 TOPICS: Lipids

Like part 1 on carbohydrates this gives you a full summary on all that you need to know about lipids.

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Preview of Biological molecules AQA AS Biology PART 2 of 8 TOPICS: Lipids

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Biological molecules (AQA AS Biology) PART 2 of 8 TOPICS
Lipids:
Triglycerides are formed by the condensation reactions of one molecule of glycerol and 3 molecules of
fatty acids to create ester bonds:
Triglycerides have fatty acids with double bonds which increase solubility. Triglycerides that are
liquids at room temperatures are classed as oils and any that are solids are classed as fats.
Phospholipids are used in the bilayer of cell membranes where it is impermeable (only allows water
and gases to diffuse in or out and not large molecules) as it has a hydrophilic head and hydrophobic
tails:

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