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    Effect of anoxic water to bacteria

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    Some species of bacteria that live at the surface of sediment on the bottom of lakes are facultative anaerobes; that is, they are capable of either aerobic or anaerobic respiration. How will their metabolism change during the summer when the deep water becomes anoxic (deoxygenated)? If the bacteria continue to grow at the same rate, will glycolysis increase, decrease, or remain the same after the lake becomes anoxic? Explain why.

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    Some bacteria have to use oxygen for metabolim, others are killed by oxygen, and still others, the facultative anaerobic bacteria, can live either in the presence or absence of oxygen. The facultative organisms are the most versatile, because they preferentially utilize oxygen as a terminal electron acceptor, but also can metabolize in the absence of oxygen by reducing other compounds. Much more usable ...