Lipids {cholesterol}| can have quadruple aromatic carbon rings. Cholesterol is the fundamental structure in steroid hormones. Plants have no cholesterol, which is only in animals.
process
Acetate becomes acetyl-CoA and acetoacetyl-CoA. Added water makes 3-hydroxy-3-methyl-glutaryl CoA, which reduces to mevalonate when CoA leaves. ATP adds three phosphates to alcohol oxygens to reduce mevalonate to activated isoprene isopentyl pyrophosphate. Isoprenes cyclically add to make squalene. Squalene epoxide makes cholesterol. Adding functional groups to ring carbons makes other steroids from cholesterol.
Physical Sciences>Chemistry>Biochemistry>Lipid>Kinds>Steroid
5-Chemistry-Biochemistry-Lipid-Kinds-Steroid
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Date Modified: 2022.0224