Classify each of the following types of lipids as (1) an energy-storage lipid (2) a membrane lipid (3) an emulsification lipid or (4) a messenger lipid.

a. Bile acids b. Cholesterol c. Eicosanoids d. Sphingophospholipids


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A bile acid\textbf{bile acid} is a cholesterol derivative that functions as a lipid-emulsifying agent in the aqueous environment of the digestive tract.

Cholesterol\textbf{Cholesterol} is a C27C_{27} steroid molecule that is a component of cell membranes and a precursor for other steroid-based lipids.

An eicosanoid\textbf{eicosanoid} is an oxygenated C20C_{20} fatty acid derivative that functions as a messenger lipid.

A sphingophospholipid\textbf{sphingophospholipid} is a lipid that contains one fatty acid and one phosphate group attached to a sphingosine molecule and an alcohol attached to the phosphate group.

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