<P> Fermentation reacts NADH with an endogenous , organic electron acceptor . Usually this is pyruvate formed from sugar through glycolysis . The reaction produces NAD+ and an organic product , typical examples being ethanol , lactic acid , carbon dioxide , and hydrogen gas ( H ) . However , more exotic compounds can be produced by fermentation , such as butyric acid and acetone . Fermentation products contain chemical energy ( they are not fully oxidized ) , but are considered waste products , since they can not be metabolized further without the use of oxygen . </P>
<P> Fermentation reacts NADH with an endogenous , organic electron acceptor . Usually this is pyruvate formed from sugar through glycolysis . The reaction produces NAD+ and an organic product , typical examples being ethanol , lactic acid , carbon dioxide , and hydrogen gas ( H ) . However , more exotic compounds can be produced by fermentation , such as butyric acid and acetone . Fermentation products contain chemical energy ( they are not fully oxidized ) , but are considered waste products , since they can not be metabolized further without the use of oxygen . </P>
what type of gas is produced during fermentation
what type of gas is produced during fermentation
hydrogen gas ( H )
hydrogen gas ( H )