U fiirso qoraalka hoose ka dibna ka jawaab su'aasha kadib isla luqadda qoraalka:  Gelitaanka: Saliidaha dufanka leh waxaa sameeya synthases fatty acid oo polymerize ka dibna yareeya unugyada acetyl-CoA. Silsiladaha acyl ee ku jira asiidhada dufanka leh waxaa lagu kordhiyaa wareegyo falcelin ah oo ku daraya kooxda acyl, ku yareeya aalkolada, ku qasi kooxda alkene ka dibna ku yareeya kooxda alkane. Ensaamyada biosynthesis ee asiidhka dufanka ah waxaa loo qaybiyaa laba kooxood: xayawaanka iyo fangaska, dhammaan falcelinta synthase ee asiidhka dufanka waxaa fuliya hal borotiin oo noocyo badan leh, halka dhirta plastids iyo bakteeriyada ay ku jiraan noocyo kala duwan oo nooca II ah. Terpenes iyo isoprenoids waa fasal weyn oo lipids ah oo ay ku jiraan carotenoids waxayna sameeyaan fasalka ugu weyn ee alaabada dabiiciga ah ee dhirta. Isku-darkaan waxaa lagu sameeyaa isku-darka iyo beddelidda unugyada isoprene-ka ee laga soo qaatay isopentenyl pyrophosphate iyo dimethylallyl pyrophosphate. Noocyadaas hore waxaa loo samayn karaa siyaabo kala duwan. Xayawaanka iyo archaea, wadada mevalonate waxay soo saartaa xeryahooda acetyl-CoA, halka dhirta iyo bakteeriyada wadada aan-mevalonate ay u isticmaasho pyruvate iyo glyceraldehyde 3-phosphate sida substrate. Mid ka mid ah falcelinta muhiimka ah ee isticmaala kuwa bixiya isoprene ee firfircoon waa biosynthesis steroid. Halkaan, unugyada isoprine-ka ayaa isugu dhafan si ay u sameeyaan squalene ka dibna way iskala baxaan si ay u sameeyaan xargaha si ay u sameeyaan lanosterol. Lanosterol waxaa markaa loo beddeli karaa steroids kale sida kolestaroolka iyo ergosterol.  Suaal: Waa maxay heerka ugu dambeeya ee unugyada isoprene ee loo badali karo kolestaroolka iyo ergosterol?
daawada loo yaqaan'lanosterol '