The end product of one stage fermentation is
**Core Concept**
Anaerobic glycolysis is a metabolic process that occurs in the absence of oxygen. It is a crucial stage in the fermentation process, where pyruvate is converted into a different end product. This process is essential for energy production in certain microorganisms and tissues.
**Why the Correct Answer is Right**
During one stage fermentation, pyruvate is converted into lactic acid by the enzyme lactate dehydrogenase. This reaction is essential for maintaining the cellular pH balance and providing energy for the cell. The conversion of pyruvate to lactic acid is a key step in anaerobic glycolysis, which occurs in the cytosol of cells.
**Why Each Wrong Option is Incorrect**
**Option A:** Ethanol is the end product of a different stage of fermentation, where pyruvate is converted into acetaldehyde and then ethanol. This process occurs in the mitochondria of yeast cells and is not related to the stage being asked about.
**Option B:** Acetic acid is not a direct end product of one stage fermentation. It is a byproduct of a different metabolic pathway and is not relevant to the question.
**Option C:** This option is blank, so we cannot evaluate it.
**Clinical Pearl / High-Yield Fact**
Remember that anaerobic glycolysis is essential for energy production in tissues with high energy demands, such as skeletal muscle during intense exercise. The conversion of pyruvate to lactic acid is a key step in this process.
**Correct Answer: C. Lactic acid**