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September 6-ch 3 - September 6 2007 Chapter 3 Waxes Waxes...

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September 6, 2007 Chapter 3 Waxes Waxes are composed of long hydrocarbon chains are strongly hydrophobic Waxes are highly saturated and sold at room temperature Waxes form water proof coatings o Leaves and stems of plants o Fur in mammals o Exoskeleton Used to make honeycombs Phospholipids Form plasma membranes around all cells o 2 fatty acids + glycerol + a short polar functional group Steroids o Steroids are composed of four carbon rings fused together o Cholesterol o Testosterone o Estrogen Proteins o Proteins have a variety of functions o Enzymes catalyze (speed up) reactions o Structural proteins (e.g. elastin) provide support o Movement o Actin and myosin in muscle o Antibodies o Storage o Hormones o All amino acids have similar structure o All contain amino and carboxyl groups o All have a variable “R” group Gives amino acids its distinctive properties Some are hydrophobic Cysteine R groups can form disulfide bridges o
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