lecture 2 Flashcards
where are lipids soluble
non polar organic solvents
what are triglycerides -triester of glycerol and fatty acids used for
storage of energy in animals and plants
what are phospholipids made of
diesters of phosphoric acid
ionic head and non polar tails
properties of fatty acids
straight chain
even number of carbons
double-bonds are cis and non conjugated
are unsaturated fatty acids liquids or solids
liquids
what does fluidity depend on fatty acid
length and saturation of fatty acid tails
experimental evidence of structure of phospholipids
pure phospholipids form closed, spherical bilayer, a vesicle
and flat bilayer across a hole between compartments of water
what drives bilayer formation
hydrophobic effect
what is the hydrophobic affect
water hydrogen bonds around hydrophobic groups ordered
hydrophobic groups interact and surface area reduced
increased entropy
change in number of ordered water molecules around hydrophobic group
7 per hydrophobic so 14 for 2
9 once combined so 4 released into the bulk
fluid mosaic model
proteins are tiles which shift the spaces between are fluid like phospholipids
constrained within the plane but diffuse laterally
what is difference between terpenes and terpenoids
terpenes are hydrocarbons and terpenoids are oxygen containing hydrocarbons
lipids with 5 carbon biochemical precursor
what are steroids
derivatives of the triterpenoids lanosterol or cycloartenol
hormones in animals
cell membrane
common structure of steroids
fused ring structure
is IPP nucleophile or electrophile
nucleophile
