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Unformatted text preview: transferred to ATP. In respiration, glucose is oxidized (releasing energy) and oxygen is reduced to form water. The carbon atoms of the sugar molecule are released as carbon dioxide (CO 2 ). The complete breakdown of glucose to carbon dioxide and water requires two major steps: 1) glycolysis and 2) aerobic respiration. Glycolysis produces two ATP. Thirty-four more ATP are produced by aerobic pathways if oxygen is present. In the absence of oxygen, fermentation reactions produce alcohol or lactic acid but no additional ATP....
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