Ravandhoi biokhimiyavie, ki dar hujayra ba amal meoyand, bevosita ba sokhtori hujayrai zinda vobasta buda, har yaki onho yagon vazifaro ijro mekunand. CHunin sokhtori hujayrahoro organoid menomand va onho hamchun uvzhoi tomi organizm vazifai makhsusro ijro mekunand.
Olimon zimni tadqiqothoe, ki bo yorii asbobhoi hozirazamon guzaronidaand, imkon paydo kardand, ki nozukihoi sokhti hujayraro omukhta, hamai organizmhoi zindaro az jihati sokhtor ba organizmhoi
behasta – beyadro (prokariotho) va hastador – yadrodor (eukariotho) judo kunand. Ba guruhi prokariotho bakteriyaho va obsabzhoi sabz, ba guruhi eukariotho zanburugho, rastaniho va hayvonot mansuband.
Organizmhoi prokarioti khususiyathoi sokhtori qadimaro nigoh doshta, khele sodda meboshand, baroi hamin onhoro ba olami alohida judo mekunand. Organizmhoi eukarioti pardai hastai doshta, sokhtashon murakkab ast; doroi qarorgohi energetiki – mitokhondriya meboshand. Bo iborai digar, sokhti hamai hujayrahoi hastador (eukariotho) murakkab buda, qobiliyati az khud kardani oksigenro dorand va energiyai ziyod hosil mekunand.