Ho

^^ Hydroxyl group attached to a ring

Figure 2.28 Steroid (a) General formula showing the four-membered ring and (b) the —OH group that make the molecule a sterol.The sterol shown here is cholesterol.The carbon atoms in the ring structures and the attached hydrogen atoms are not shown.

commonly found in the cytoplasmic membrane of eukaryotic cells, but only one group of prokaryotic cells; the mycoplasmas, contain sterols (see chapter 3). Other important compounds in this group of lipids are certain hormones such as cortisone, progesterone, and testosterone.

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