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29795474
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2021-04-22T02:18:56Z
Lipids
Steroids
Are composed of four rings
of carbon atoms
Cholesterol, testosterone, estrogen
Lipids
Hydrophobic and
water soluble
All lipids contain large chains of
nonpolar hydrocarbons
Diverse groups of molecules that
contain regions composed
almost entirely of H ad C
Fats
Are used primarly as
energy-storage molecule
Solid at room temperature
Produced primarly by animals
Contains more than twice
as many calories per gram
Structure
Carbons fatty acids are joined by single bonds
with H atoms at all the other bonding sites
Oils
Structure
Fatty acids double bonds between some of the
carbons and consequently fewer hydrogens
Are used primarly as
energy-storage molecules
Contains more than twice as
many calories per gram
Liquid at room temperature
Kinks prevent oil molecules from
packing closer together
Found in plant seeds
Unsaturated
Fatty acids that have double bonds between some of
the carbon and consequently fewer hydrogens
Saturated
Fatty acids that contain as many
hydrogens as possible
Saturated fatty acid chains are straights and can pack closely
together thus forming a solid at room temperature
Waxes
Form a waterproof coating over the
leaves and stems of plants
Chemically similar to fats
Highly saturated meaning
solid at room temperature
Humans do not have the appropriate
anzymes to break them down
Phospholipids
Found in the plasma membrane
that surrounds each cell
Similar to oils except they have a phosphate group
attached to any of several polar function groups
Two similar ends
Two nonpolar fatty acid tails in insoluble water
Phosphate nitrogen head polar and water soluble
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29795474
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2021-04-22T02:18:56Z
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