Cells reduce oxygen and hydrogen donors to water, and then oxidize water to oxygen {oxygen cycle}. Aerobe organisms use oxygen as electron acceptors to cause reduction. Obligate-anaerobe organisms use sugar as electron acceptor to cause reduction. Facultative-aerobe organisms use either oxygen or sugar but prefer oxygen as electron acceptor to cause reduction. Anaerobe organisms do not use oxygen.
Physical Sciences>Chemistry>Biochemistry>Chemical Cycle
5-Chemistry-Biochemistry-Chemical Cycle
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Date Modified: 2022.0224