Test 3 Flashcards
(271 cards)
what are lipids (4)
fats are lipids that are solid at room temp
oils are lipids that are liquid at room temp
Insoluble in water
Diverse functions: energy storage, structural, signaling
what are the classes of lipids (5)
free fatty acids triacylglycerols phospholipids glycolipids steroids
what are storage lipids derived from
HIGHLY REDUCED hydrocarbon compounds called fatty acids
why are fatty acids called fatty “acids”
because one end contains a carboxylic acid
are most fatty acids even or odd numbered
even
what is the range in number of carbons
4 to 36
what are fatty acids with 0 double bonds called
saturated fats
what are fatty acids with 1 double bond called
monounsaturated fatty acid (MUFA)
what are fatty acids with 2 or more double bonds called
polyunsaturated fatty acid (PUFA)
How many kcal/g do lipids provide
9
how many kcals in ~1 pound of fat
3500
what is another name for fatty acids
acyls
what are the two areas of classification of fatty acids
number of carbons (length)
number of bonds (saturation)
How many carbons are present in a short chain fatty acid
4-6
how many carbons are present in a medium chain fatty acid
8-12
how many carbons are present in a long chain fatty acid
14-24
How many bonds are present in a saturated fatty acid
0
how many bonds are present in a MUFA
1
how many bonds are present in a PUFA
2 or more
Are saturated fatty acid oil or fat at room temp? and why?
fat. a lack of double bonds makes it easy for them to lay in uniform, tightly packed, crystalline formation
are MUFAs oil or fat at room temp and why
oil. the ‘kink’ created by the single double bond makes it difficult for the FA to lay down in uniform manner
are PUFAs oil or fat at room temp and why
oil. the multiple ‘kinks’ created by the multiple double bonds makes it difficult for the FA to lay down in uniform manner
What functional group is present at the omega end of all fatty acids (SFA, MUFAs and PUFAs)
methyl (CH3)
what functional group is found between double bonds in a PUFA
methylene (CH2)