Where does TCA cycle takes place :–

Options

A. Cytoplasm
B. Inner membrane of mitochondria
C. Outer membrane of mitochondria
D. Mitochondrial matrix

Answer

**Step-by-Step Solution:**

1. **Understanding the TCA Cycle**: The TCA cycle, also known as the Krebs cycle or citric acid cycle, is a crucial metabolic pathway that plays a significant role in cellular respiration. It is responsible for the oxidation of acetyl-CoA to produce energy in the form of ATP, as well as electron carriers NADH and FADH2.

2. **Identifying the Location**: The TCA cycle takes place in the mitochondria of eukaryotic cells. Mitochondria are often referred to as the "powerhouses of the cell" because they generate most of the cell's supply of adenosine triphosphate (ATP), which is used as a source of chemical energy.

3. **Mitochondrial Structure**: Mitochondria have a double membrane structure. The outer membrane is smooth, while the inner membrane is highly folded into structures known as cristae. The space inside the inner membrane is called the mitochondrial matrix, and this is where the TCA cycle occurs.

4. **Conclusion**: Therefore, the TCA cycle takes place in the mitochondrial matrix of eukaryotic cells.

**Final Answer**: The TCA cycle takes place in the mitochondrial matrix.

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