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triglycerides
nonpolar hydrophobic molecules made of one glycerol molecule and 3 fatty acid molecules
bonding
bonding occurs between free OH groups of glycerol and opposing free OH groups of fatty acid molecules
ester bonds
formed between triglyceride building blocks when water is removed
condensation reaction
when water is added
saturated fatty acids
has a straight appearance
unsaturated fatty acid
kinked appearance due to carbon double bond
phospholipid
have hydrophilic head formed by a phosphate group
importance of triglycerides
prevent dehydration in plants waxy cuticle…energy reserve and for insulation…sex hormone function
importance of phospholipids
one fatty acid replaced by phosphate group to create hydrophilic head which has an affinity to water…form plasma membranes
hydrophilic heads
heads are attracted to each other in water whereas tails point away from water creating a double layer carpet of phospholipids which can enclose cavities