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胆固醇是真核细胞中原生质膜和内质膜的普遍成份。它们具有增强膜的内聚力。原核生物在正常状态下不含胆固醇。大多数真核菌和兰绿藻菌群(但不是古细菌)不含三萜,而含茉萜类(hopaneids*),最初在分子化石中发现它们对磷酯层具有胆固醇的相同作
Cholesterol is a common component of the plasma membrane and the endoplasmic membrane in eukaryotes. They have the effect of enhancing the cohesion of the film. Prokaryotes do not contain cholesterol under normal conditions. Most eukaryotic and blue-green algae strains (but not archaebacteria) do not contain triterpenes, but hopaneids * were found initially in molecular fossils to find that they have the same effect on cholesterol ester in the phospholipid layer