How many complexes are involved in electron transport in mitochondria ?

Options

A. 1
B. 2
C. 4
D. 5

Answer

To answer the question "How many complexes are involved in electron transport in mitochondria?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Mitochondrial Function**:
- Mitochondria are known as the powerhouse of the cell, primarily responsible for generating ATP through cellular respiration.

2. **Electron Transport Chain (ETC)**:
- The process of ATP generation involves the electron transport chain (ETC), where electrons are transferred from electron donors to electron acceptors.

3. **Identification of Complexes**:
- In the mitochondria, the electron transport chain consists of several complexes that facilitate this transfer of electrons.

4. **Counting the Complexes**:
- There are four large multiprotein complexes (Complex I, Complex II, Complex III, and Complex IV) embedded in the inner mitochondrial membrane that are involved in the electron transport process.

5. **Additional Components**:
- In addition to these four complexes, there are two small diffusible electron carriers (ubiquinone and cytochrome c) that assist in the transfer of electrons between the complexes.

6. **Final Answer**:
- Therefore, the number of complexes involved in the electron transport in mitochondria is **four**.