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Download Alcoholic fermentation
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ANAEROBIC RESPIRATION Complete the notes sheets below. Where you see a blank (…………………..), decide which word/phrase is most appropriate. ………………………. (which takes place in the ……………………) produces …… molecules of pyruvate. The fate of the pyruvate depends on …………………… availability. In the absence of oxygen, alcoholic fermentation or lactic fermentation takes place. 2 x PYRUVATE (….C) 1. Alcoholic fermentation: When there is insufficient …………………….., it is important that the reduced NAD (……………) is …………………….. back to NAD+ so that the energy yielding phase of glycolysis can continue. In yeast, pyruvate is decarboxylated to ETHANAL (…..C), releasing …………….. . The enzyme alcohol dehydrogenase then ……………….. ETHANAL to ETHANOL (…..C), at the same time ………………… NADH back to ……………. . CH3CHO + NADH C2H5OH +NAD+ Alcohol dehydrogenase The process is summarised below: NADH NAD+ Alcohol dehydrogenase C2H5OH + CO2 1|Page What is the net production of ATP per molecule of glucose in anaerobic respiration using alcoholic fermentation? …………… ATP molecules 2. Lactic fermentation: The main aim of lactic fermentation is to ………………………………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………… Pyruvate is …………………… by NADH to form ………………………… acid. As this is a redox reaction, NADH is ………………………… back to ……………. since an …… atom is donated to the pyruvate. This reaction is catalysed by lactate dehydrogenase. 1 molecule of NADH is ………………….. per pyruvate molecule. 1 molecule of glucose will produce ………… molecules of ATP in using this form of …………………………… respiration. The process is summarised below: NADH NAD+ Lactate dehydrogenase C3H6O 2|Page