Who proposed the chemiosmotic mechanism of ATP synthesis ?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks who proposed the chemiosmotic mechanism of ATP synthesis. This mechanism is crucial in understanding how ATP (adenosine triphosphate), the energy currency of the cell, is produced.

2. **Identifying the Mechanism**: The chemiosmotic mechanism, also known as the chemiosmotic hypothesis, describes how ATP is synthesized in cells through the formation of an electrochemical gradient across membranes, specifically involving protons (H+ ions).

3. **Recognizing the Scientist**: The scientist who proposed this mechanism is Peter Mitchell. He introduced the chemiosmotic hypothesis in 1961.

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