lipids Flashcards
4 roles of lipids
source of energy
waterproofing
insulating
protection
what is triglyceride made out of
3 fatty acids and a glycerol
what bonds form between lipids and how are they formed
ester bond formed in a condensation reaction
what does the hydrolysis reaction of a triglyceride produce
3 fatty acids and glycerol (and 3 water molecules)
define saturated fatty acid
hydrogen carbon chain has no carbon-carbon double bonds
define mono saturated
single double bond in the HC chain
define polyunsaturated
multiple double bonds in the HC chain
4 properties of triglycerides
excellent source of energy
good storage molecule
large, non polar molecule
release water when oxidised
why are triglycerides excellent sources of energy
high ratio of energy storing carbon-hydrogen bonds to carbon atoms
why are triglycerides good storage molecules
low mass to energy ratio, much energy can be stored in a small volume
benefit of triglycerides being large, non polar molecules
insoluble in water, storage doesn’t affect osmosis in cells or the water potential in them
why do triglycerides release water when oxidised
high ratio of hydrogen to oxygen atoms
which type of lipid has polar molecules
phospholipids
which part of a phospholipid molecule is hydrophobic
fatty acids
which part of a phospholipid is hydrophilic
the phosphate molecule
