The inner membrane of mitochondria is permeable to

Options

A. Glucose
B. Fructose
C. Sucrose
D. ATP.

Answer

### Step-by-Step Solution:

1. **Understanding Mitochondria Structure**:
- Mitochondria are double-membrane organelles found in eukaryotic cells. They consist of an outer membrane and an inner membrane.

2. **Function of Mitochondria**:
- Mitochondria are known as the "powerhouse of the cell" because they convert nutrients into energy in the form of ATP (adenosine triphosphate), which is essential for various cellular activities.

3. **Inner Membrane Characteristics**:
- The inner membrane of mitochondria is highly specialized and contains proteins that are crucial for the electron transport chain and ATP synthesis.

4. **Permeability of the Inner Membrane**:
- The inner membrane is selectively permeable. It allows certain molecules to pass through while restricting others.

5. **Evaluating Options**:
- The question asks what the inner membrane is permeable to.
- **Glucose**: A six-carbon sugar that cannot pass through the inner membrane due to its size and structure.
- **Fructose**: Another monosaccharide that is also too large to pass through the inner membrane.
- **Sucrose**: A disaccharide made of glucose and fructose, which is also too large to pass through the inner membrane.
- **ATP**: The energy currency of the cell, which is indeed permeable through the inner membrane.

6. **Conclusion**:
- After evaluating the options, it is clear that the inner membrane of the mitochondria is permeable to ATP.

### Final Answer:
The inner membrane of mitochondria is permeable to **ATP**.

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