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Title: AQA AS BIOLOGY LIPIDS
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.
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Lipids contain Carbon/ Hydrogen/ Oxygen
...
Insoluble in water
Emulsion Test:
Mix ethanol and the test material /
shake to help dissolve lipids present / add water / shake ——> milky
white emulsion indicates the presIf there is a single double bond = ence of lipids
...
A triglyceride is an ester of fatty
acids and glycerol
...
Triglyceride ^^^
A molecule of fatty acid consists of a
hydrocarbon chain and carboxyl group
Molecules that have two ends
(-COOH)
...
Insoluble in water and store
chemical energy
Readily hydrolysed to fatty acids
and glycerol
If there is more than one double bond = polyunsaturated
...
Used in respiration when glucose
in short supply
Can pass through phospholipid
bilayer of cell membranes
Phospholipids:
Similar to lipids but a fatty acid is replaced by a
phosphate molecule
...
Insulation (a layer of fat beneath the skin prevents heat loss/
overheating as fat isn't a good conductor of heat
...
Triglycerides have low mass to energy
ratio = good storage molecules
...
Their storage doesn't
affect osmosis in cells or the water potential of them
Title: AQA AS BIOLOGY LIPIDS
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.