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(A) During the fermentation of a glucose molecule,the process begins with glycolysis,which produces $2$ molecules of pyruvic acid,$2$ $NADH$,and a net

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$2$

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(A) During the fermentation of a glucose molecule,the process begins with glycolysis,which produces $2$ molecules of pyruvic acid,$2$ $NADH$,and a net gain of $2$ $ATP$ molecules.In anaerobic conditions (fermentation),these pyruvic acid molecules are converted into ethanol and $CO_{2}$ (in alcoholic fermentation) or lactic acid (in lactic acid fermentation).Since the $NADH$ produced during glycolysis is consumed to reduce pyruvic acid,no additional $ATP$ is generated during the fermentation steps.Therefore,the net gain remains $2$ $ATP$ molecules per glucose molecule.The overall reaction for alcoholic fermentation is: $C_{6}H_{12}O_{6} + 2ADP + 2\Pi \rightarrow 2C_{2}H_{5}OH + 2CO_{2} + 2ATP$.

How many $ATP$ molecules are obtained from the fermentation of $1$ molecule of glucose?

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