Biology / Bio 0205 · Atom · ~20 seconds
Steroids
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A steroid is a lipid built from four fused carbon rings rather than the long chains that make up fatty acids.
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Cholesterol is a steroid, and its four-ring backbone is also the starting structure several hormones are built from.
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A steroid's ring structure sets it apart from every other lipid in this unit, which are all chain-based instead.