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Properties of organic compounds depend on
Carbon skeleton and how the functional groups attach to the backbone
Things that need lipids
hibernating animals (bears, frogs) , migrating animals (geese), seeds (peanut, sunflower)
Functions of lipids
Do not attract water, so they are stored in a concentrated form. Polar carbohydrates (have a charge) must be surrounded by water and this adds weight
Animals needing lots of fat for hibernation/insulation produce high proportion of
unsaturated fatty acids
Animals must get their amino groups pre-formed, directly from
plant foods, single-celled organisms, or from protein in milk, eggs, or body tissues of other animals
Essential amino acids
Cannot be synthesized in the body out of materials available. 9 essential ones
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