Chapter 5b - Fermentation Used by organisms that cannot...

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Fermentation Used by organisms that cannot respire Due to lack of suitable inorganic electron acceptor or lack of electron transport chain Anaerobic; Occurs in the cytoplasm ATP produced only in glycolysis Recycles NADH Fermentation pathways use pyruvate or derivative as terminal electron acceptor
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Lactic acid fermentation pyruvate molecules formed in glycolysis are converted to 2 lactate molecules pyruvate molecules accept the electrons from NADH Lactobacillus and Streptococcus bacteria that produce cheeses, yogurt, and sauerkraut
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Ethyl alcohol fermentation – pyruvate loses a molecule of CO 2 and becomes acetaldehyde NADH transfers electrons and hydrogen to acetaldehyde to form ethanol EX. Saccharomyces cerevisiae Yeast used in bread and beer production
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Catabolism of Other Organic Compounds Carbohydrates are the main energy source glucose Microbes may also utilize lipids and proteins Both must be broken down into their individual components Each component is oxidized separately
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