Glycolysis occurs in _______, the TCA cycle occurs in ________, and ETC occurs in __________.

Options

A. Mitochondrial matrix, cytosol, mitochondrial inner membrane
B. Cytosol,mitochondrial matrix, mitochondrial inner membrane
C. Mitochondrial outer membrane, cytosol, mitochondrial inner membrane
D. Cytosol, outer chamber of mitochondrial, inner chamber of mitochondria

Answer

To answer the question, we need to identify the locations of glycolysis, the TCA cycle, and the electron transport chain (ETC) in a cell.

### Step-by-Step Solution:

1. **Identify the location of Glycolysis**:
- Glycolysis is the first step in the process of cellular respiration. It occurs in the **cytosol** of the cell. During glycolysis, glucose is broken down into pyruvic acid.

2. **Identify the location of the TCA Cycle**:
- The TCA cycle, also known as the Krebs cycle or citric acid cycle, takes place in the **mitochondrial matrix**. After glycolysis, the pyruvic acid produced is converted into acetyl CoA, which then enters the TCA cycle.

3. **Identify the location of the Electron Transport Chain (ETC)**:
- The ETC occurs in the **inner membrane of the mitochondria**. The products from the TCA cycle, such as NADH and FADH2, donate electrons to the ETC, which is crucial for ATP production.

### Final Answer:
Glycolysis occurs in **cytosol**, the TCA cycle occurs in **mitochondrial matrix**, and the ETC occurs in **inner membrane of mitochondria**.

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