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BI220 E1 L12

lecture 12 slides

QuestionAnswer
lipids hydrophobic molecules
lipid types fats, oils, waxes, steroids
triglycerides lipid class - glycerol backbone & 3 fatty acid carbon chains (fats, oils)
glycerol 3carbon alcohol
fatty acid long hydrocarbon w carboxyl group at one end
lipid bonds ester bond
saturated fatty acid chain single bonds only, completely filled w carbon & hydrogen (solid at room temp, called solid fats)
unsaturated fatty acid chain double bonds (liquid like at room temp; called oils), usually cis configuration
lipids functions store energy, form membrane, steroids
phospholipids polar head group, 2 fatty acid chains
amphipathic contains hydrophilic & hydrophobic parts
micelle spherical lipid droplets formed by phospholipids in water
phospholipid bilayer membrane formed by hydrophobic fatty acid interactions
steroids lipid class - 4 fused carbon rings. cell signaling, hormonal regulation, maintenance of cell membrane fluidity
cholesterol roles precursor to many human hormones, modulates fluidity of plasma membrane by inserting between phospholipids
cholesterol membrane effects lower temps - increases fluidity higher temps - decreases fluidity
fluid mosaic model ratios 75% phospholipids 20% cholesterol 5% glycolipids
Created by: knorrod
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