Alcoholic fermentation occurs in organisms such as yeast, as produces ethyl alcohol. Lactic acid fermentation occurs in animals such as humans and produces lactic acid instead of alcohol.
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Pyruvic acid (or pyruvate) is simply one of the compounds in the metabolic pathway from sugars to carbon dioxide and water. From pyruvate (a three cabon unit) either one of two reactions can occur. It can react to form lactose or lose a carbon dioxide molecule to become a two carbon unit and enter the Krebs cycle.
To determine if a bacterium can ferment a particular carbohydrate and determine the end products of that fermentation
Purpose on a science fair is basically what was the purpose that you chose to do the certain project in the first place or it could mean the purpose of the experiment.
In making bread - Bread dough contains yeast (a fungus), and sugar. When the dough is left in a warm place, the yeast cells feed on the sugar to obtain energy. Enzymes in the yeast catalyse the reaction, which is called fermentation: C6H12O6 (aq) ------> 2C2H5OH (aq) + 2CO2 (g) + energy in other words: Glucose ------> ethanol + carbon dioxide + energy
General purpose means it can be used for many things. Special purpose means only for a particular thing.