The main difference between lactic acid fermentation and alcoholic fermentation is that lactic acid fermentation a. produces mor
e energy than alcoholic fermentation. b. produces less energy than alcoholic fermentation. c. regenerates NAD⁺ but alcoholic fermentation does not. d. regenerates a two-carbon molecule, but alcoholic fermentation does not. e. regenerates a three-carbon molecule and alcoholic fermentation does not.
e. regenerates a three-carbon molecule and alcoholic fermentation does not.
Explanation:
Lactic acid fermentation includes the reduction of pyruvate into lactate. Lactate is a three-carbon molecule. Reduction of pyruvate into lactate also regenerate NAD+ required to continue the process of glycolysis.
Alcoholic fermentation includes decarboxylation of pyruvate into acetaldehyde followed by its reduction of alcohol. The alcohol formed as end product is a two-carbon molecule (ethanol). Here, NADH serves as electron donor and is oxidized into NAD+. Therefore, both the process regenerate NAD+ but ethanol fermentation does not regenerate the three-carbon molecule since one carbon is lost as CO2.
Diffusion is defined as a spontaneous movement of molecules to a region of low concentration from the region of high concentration of those molecules. It does not involve use of energy and is a passive process. Diffusion is slow process that gets affected by distance as higher distance shows lower rate of diffusion.