<P> Simplified Theoretical Reaction: C H O + 6O → 6CO + 6H O + ~ 30ATP </P> <P> Cells undergoing aerobic respiration produce 6 molecules of carbon dioxide, 6 molecules of water, and up to 30 molecules of ATP (adenosine triphosphate), which is directly used to produce energy, from each molecule of glucose in the presence of surplus oxygen . </P> <P> In aerobic respiration, oxygen serves as the recipient of electrons from the electron transport chain . Aerobic respiration is thus very efficient because oxygen is a strong oxidant . Aerobic respiration proceeds in a series of steps, which also increases efficiency - since glucose is broken down gradually and ATP is produced as needed, less energy is wasted as heat . This strategy results in the waste products H O and CO being formed in different amounts at different phases of respiration . CO is formed in Pyruvate decarboxylation, H O is formed in oxidative phosphorylation, and both are formed in the citric acid cycle . The simple nature of the final products also indicates the efficiency of this method of respiration . All of the energy stored in the carbon - carbon bonds of glucose is released, leaving CO and H O. Although there is energy stored in the bonds of these molecules, this energy is not easily accessible by the cell . All usable energy is efficiently extracted . </P> <P> Anaerobic respiration is done by aerobic organisms when there is not sufficient oxygen in a cell to undergo aerobic respiration as well as by cells called anaerobes that selectively perform anaerobic respiration even in the presence of oxygen . In anaerobic respiration, weak oxidants like sulfate and nitrate serve as oxidants in the place of oxygen . </P>

What is a waste product of aerobic respiration
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