Question

The end products of fermentation when sugar is used as raw materials is/are
A) Alcohol and $CO_2$​
B) Alcohol and pyruvate
C) $CO_2$.
D) Alcohol

Answer 1

Hint: One glucose molecule is changed into two pyruvic acid molecules by glycolysis. In the cell cytoplasm, glycolysis occurs. Anaerobic respiration is a cytosolic process that occurs in the production of ethanol and carbon dioxide, or lactic acid (lactic acid fermentation) (alcoholic fermentation).

Complete answer:
Respiration can be anaerobic or aerobic. In both environments, glycolysis, which happens in the absence of oxygen, is widespread. One glucose molecule is changed into two pyruvic acid molecules by glycolysis. In the cell cytoplasm, glycolysis occurs. Anaerobic respiration is a cytosolic process that occurs in the production of ethanol and carbon dioxide, or lactic acid (lactic acid fermentation) (alcoholic fermentation).
The mechanism that occurs when ethanol and carbon dioxide or lactic acid (lactic acid fermentation) are formed (alcoholic fermentation).
The fermentation of ethanol, also called alcoholic fermentation, is a biochemical process that converts cellular energy into sugars such as glucose, fructose, and sucrose, producing ethanol and carbon dioxide as by-products. In the absence of oxygen, alcoholic fermentation is called an anaerobic process because yeasts perform this conversion. It also takes place in certain types of fish (including goldfish and carp) where, when oxygen is insufficient, it provides nutrition (along with lactic acid fermentation).

Hence, the correct answer is option (A).

Note: Zymomonas mobilis can also be used to ferment sugar into ethanol and CO2, although the route is somewhat different since pyruvate production does not occur by glycolysis, but rather through the Entner-Doudoroff pathway. Other microorganisms may generate ethanol from sugars by fermentation but mostly only as a side product.