Under anaerobic conditions the glycolysis of one mole of glucose yields __moles of ATP.
**Core Concept**
The underlying principle being tested is the understanding of **glycolysis** under **anaerobic conditions**, where glucose is broken down to produce energy in the form of **ATP** without the presence of oxygen. This process occurs in the **cytosol** of cells and is crucial for energy production in certain conditions.
**Why the Correct Answer is Right**
Under anaerobic conditions, one mole of glucose is converted into two moles of **pyruvate** through glycolysis, producing a net gain of two moles of **ATP**. This is because two **ATP** molecules are consumed during the initial steps of glycolysis, but four **ATP** molecules are produced, resulting in a net yield of two **ATP** molecules.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it underestimates the net **ATP** yield from glycolysis under anaerobic conditions.
**Option B:** This option overestimates the **ATP** yield, as the complete breakdown of glucose to **CO2** and **H2O** requires **aerobic** conditions, producing more **ATP**.
**Option D:** This option is also incorrect as it suggests no **ATP** production, which is not true for glycolysis.
**Clinical Pearl / High-Yield Fact**
Remember, under **anaerobic** conditions, cells rely heavily on **glycolysis** for **ATP** production, which is less efficient than **aerobic** respiration but crucial for short-term energy needs.
**Correct Answer:** 2 moles of ATP.