The inner mitochondrial membrane contains

Options

A. Enzymes
B. Electron carriers
C. 70 S ribosomes
D. Both (1) & (2)

Answer

To solve the question "The inner mitochondrial membrane contains," we will analyze the options provided and determine which components are present in the inner mitochondrial membrane.

### Step-by-Step Solution:

1. **Understanding the Structure of Mitochondria**:
- Mitochondria have two membranes: the outer mitochondrial membrane and the inner mitochondrial membrane. The space between these membranes is called the intermembrane space, while the space enclosed by the inner membrane is called the matrix.

**Hint**: Recall the basic structure of mitochondria and the function of each part.

2. **Identifying Components of the Inner Mitochondrial Membrane**:
- The inner mitochondrial membrane is known to contain various enzymes and electron carriers.
- One important enzyme located in this membrane is succinate dehydrogenase, which plays a role in the Krebs cycle.

**Hint**: Think about the key enzymes involved in cellular respiration and where they are located.

3. **Role of Electron Carriers**:
- The inner mitochondrial membrane also contains a series of electron carriers that are part of the electron transport chain (ETC). These carriers include FMN, iron-sulfur proteins, cytochromes, and ubiquinone. They are essential for aerobic respiration, facilitating the transfer of electrons and the production of ATP.

**Hint**: Consider the process of aerobic respiration and the importance of the electron transport chain.

4. **Evaluating the Options**:
- Option 1: Enzymes - True, as succinate dehydrogenase is located here.
- Option 2: Electron carriers - True, as the electron transport chain is present.
- Option 3: 70S ribosomes - False, as these are found in the matrix, not in the inner mitochondrial membrane.
- Option 4: Both 1 and 2 - True, since both enzymes and electron carriers are present in the inner mitochondrial membrane.

**Hint**: Analyze each option carefully and cross-reference with what you know about mitochondrial structure and function.

5. **Conclusion**:
- Since both enzymes and electron carriers are present in the inner mitochondrial membrane, the correct answer is option 4: both 1 and 2.

### Final Answer:
The inner mitochondrial membrane contains both enzymes and electron carriers (Option 4).