Module 2 Flashcards
(237 cards)
are lipids homogenous or heterogenous?
heterogenous
what are the common building blocks of lipids?
they do not have any common building blocks
where do lipids occur frequently in?
nature
where can we find lipids in mammalian cell walls?
cholesterols
where can we find lipids in fungal cell walls?
ergosterol
in terms of chemistry, lipids are…
a mixed bag of compounds that share some properties based on the structural similarities, mainly a preponderance (abundance) of non-polar groups.
two main groups of lipids
hydrolysable lipids and fused-ring compounds
collective term for fixed oil, fats, and waxes
lipids
where are lipids soluble and insoluble in?
soluble in organic (non-polar) solvents and insoluble in water
due to the fact that lipids are not defined by a particular functional group…
they have a variety of structures and functions
why are lipids insoluble in water?
they contain many nonpolar C —– C and C —– H bonds and few polar bonds resulting in their water insolubility
what properties are lipids more related to each other?
physical properties
to the touch, lipids are…
greasy
lipids leave a
permanent oily stain on paper (Grease Spot Test)
which is lighter, lipids or water?
lipids
when pure, this is the color and taste of lipids
colorless and bland
causes the yellow color in fat
carotene (provitamin A)
what happens when lipids are heated strongly?
they undergo decomposition
what sort of vapors and flames do lipids produce once they are heated strongly?
acrid flammable vapors and they burn with a sooty flame
acrid flammable vapors from lipids can lead to
acrolein (propenal)
how do lipids serve within biological membranes?
as structural components (cholesterol)
lipids provide energy reserves, but in what predominant form?
triacylglycerols
both lipid and lipid derivatives serve as…
chemical messengers
aids in lipid solubilization
lipophilic bile acids