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What is a lipid + functions
An organic molecule that is used for thermal insulation (eg in adipose layer under skin)
in seeds (2x as much energy as carbohydrate = 2x lighter. Can spread further when germinating)
As storage of energy
Source of metabolic water (released during respiration)
Protection from impact damage (eg around kidneys)
Most common type of lipid
triglyceride
Why aren’t lipids polymers
Composed of glycerol and fatty acids. Structures not similar enough
Chemical formula for glycerol
C3H8O3
Draw glycerol
Draw saturated fatty acid
Are fatty acids hydrophobic or hydrophilic
Hydrophobic because hydro carbon chain is non-polar
repels water
what makes up a fatty acid?
hydrocarbon chain, carboxylic acid group
Draw an unsaturated fatty acid
Unsaturated fatty acid properties
Alkene (double bond)
Lower melting point = liquid at room temp eg. oils
Has kinks / bends in hydrocarbon chain
What type of bond is precent in a triglyceride
Ester bond (intramolecular)
What polarity is glycogen
Polar = hydrophilic
attracts water
Draw a phospholipid diagram
What is a phospholipid + function
Glycerol molecule + 2 fatty acids + phosphate group
components of plasma (cell) membranes
greater the number of unsaturated fats, greater the fluidity
draw drawing of phospholipid + phospholipid layer
What is a diet of a lot of saturated fatty acids associated with?
Coronary heart disease
Note
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