`F_1` particles are also called

Options

A. Electron transport particles
B. Elementary particles
C. Cytochromes
D. Cristae

Explanation

To answer the question "F1 particles are also called," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Context**: F1 particles are associated with the mitochondria, specifically in the context of ATP synthesis. They are found in the inner membrane of the mitochondria.

2. **Understand the Structure**: The inner membrane of the mitochondria has a folded structure known as cristae. This structure increases the surface area for biochemical reactions.

3. **Define F1 Particles**: F1 particles are rounded, stalked structures that are involved in the synthesis of ATP (adenosine triphosphate), which is the energy currency of the cell.

4. **Recognize Alternative Names**: F1 particles are also referred to as elementary particles. They are sometimes called oxysomes or ATP synthase complexes due to their role in ATP production.

5. **Evaluate the Options**: The options provided are:
- Electron transport particles
- Elementary particles
- Cytochromes
- Crystals

6. **Select the Correct Answer**: Based on the information, F1 particles are best described as elementary particles. Therefore, the correct answer is **Elementary particles**.

### Final Answer:
F1 particles are also called **elementary particles**.

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