unit 1; lipids Flashcards
list properties of lipids
insoluble in water, soluble in organic solvents
2 groups of lipids
triglycerides, phospholipids
list some roles of lipids
source of energy, insulation, waterproofing, protection
when is a fatty acid saturated
when there is no double bonds between carbon atoms
when is a fatty acid mono-unsaturated
when it contains one double bond between carbon atoms
when is a fatty acid polyunsaturated
when it contains more than one double bond between carbon atoms
why are triglycerides a good store of energy
they contain a high ratio of carbon-hydrogen bonds to carbon atoms
why are triglycerides good storage molecules
have low mass to energy ratio, more energy stores in small volume
why are triglycerides not affect the water potential of cells
since it is a large non- polar molecule, and in insoluble in water
define a polar molecule
a molecule that has 2 ends behaving in different ways
how do phospholipids form glycolipids
by combining with carbohydrates in cell- surface membrane
test for lipids
emulsion test- sample- ethanol- water milky white emulsion shows presence of lipid
