B) Lipids

. Lipids (Fats) : exs. fats, oils, waxes, steroids

-- lipids chiefly function in energy storage, protection, and insulation

-- contain carbon, hydrogen, and oxygen but the H:O is not in a 2:1 ratio

lipids tend to be large molecules -- an example of a neutral lipid is below

-- neutral lipids are formed from the union of one glycerol molecule and 3 fatty acids

3 fatty acids + glycerol ----> neutral fat (lipid)

-- fats -- found chiefly in animals

-- oils and waxes -- found chiefly in plants

-- oils are liquid at room temperature, waxes are solids

-- lipids along with proteins are key components of cell membranes

-- steroids are special lipids used to build many reproductive hormones and cholesterol