ATP is synthesized in

Options

A. Ion Channels
B. Plasmalemma
C. `F_(0)` particles
D. `F_(1)` particles.

Answer

To determine where ATP is synthesized, we will analyze the options provided and understand the process of ATP synthesis in cellular respiration.

### Step-by-Step Solution:

1. **Understanding ATP**: ATP (adenosine triphosphate) is the primary energy carrier in cells. It is produced during cellular respiration, particularly during the processes of glycolysis, the Krebs cycle, and oxidative phosphorylation.

2. **Identifying the Options**:
- **Ion Channels**: These are proteins that allow ions to pass through the membrane but are not directly involved in ATP synthesis.
- **Plasma Lemma**: This term seems to refer to the plasma membrane, which also does not play a direct role in ATP synthesis.
- **F0 Particles**: These are part of the ATP synthase complex located in the inner mitochondrial membrane, but they do not synthesize ATP directly.
- **F1 Particles**: These are the catalytic sites of ATP synthase where ATP is actually synthesized.

3. **Understanding the Role of F1 Particles**: During oxidative phosphorylation, protons (H+) flow back into the mitochondrial matrix through the F0 component of ATP synthase. This flow drives the F1 component, where ATP is synthesized from ADP and inorganic phosphate (Pi).

4. **Conclusion**: Based on the function of the components involved in ATP synthesis, the correct answer is that ATP is synthesized in the **F1 particles** of ATP synthase.

### Final Answer:
ATP is synthesized in **F1 particles**.

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