Total ATP generated per turn of TCA cycle is?

**Core Concept**
The tricarboxylic acid (TCA) cycle, also known as the citric acid cycle or Krebs cycle, is a key metabolic pathway that generates energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins. It takes place in the mitochondrial matrix and produces NADH, FADH2, and GTP (or ATP) as byproducts.

**Why the Correct Answer is Right**
During one turn of the TCA cycle, 1 GTP (which is equivalent to 1 ATP) is generated from the substrate-level phosphorylation of GDP to GTP. Additionally, 3 NADH molecules are produced, each yielding approximately 2.5 ATP equivalents during oxidative phosphorylation. Furthermore, 1 FADH2 molecule is generated, contributing approximately 1.5 ATP equivalents. Therefore, the total ATP generated per turn of the TCA cycle is the sum of these values: 1 (from GTP) + 7.5 (from NADH) + 1.5 (from FADH2) = 10 ATP.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided.
**Option B:** This option is not provided.
**Option C:** This option is not provided.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the TCA cycle is a critical component of cellular respiration, producing a significant portion of the ATP generated in the cell. However, the actual ATP yield from the TCA cycle is often underestimated, as it relies heavily on the subsequent electron transport chain for energy production.

**Correct Answer: C. 10**