Payvastagihoi organiki ba hisobi miyona 20-30%-i massai hujayrahoi organizmi zindaro tashkil medihand. Ba onho polimerhoi biologi–safedaho, kislotahoi nukleinat va angishtobho, inchunin charbho va baze molekulahoi khurdgormonho, pigmentho, ATF va gayra mansub meboshand.
Dar namudhoi gunoguni hujayraho miqdori payvastagihoi organiki yak khel nest. Dar hujayrahoi rastani angishtobhoi murakkab-polisakharidho bartari dorand; dar hayvonot safedaho va charbho ziyodand. Bo vujudi in, dar har kadom namudi hujayra har yak guruhi moddahoi organiki amalhoi monandro ijro menamoyand.