The detailed structure of cell membrane was studied only after the invention of

Options

A. Simple microscope
B. Compound microscope
C. Electron microscope
D. Phase contrast microscope

Answer

To answer the question, "The detailed structure of cell membrane was studied only after the invention of," we will analyze the options provided and determine which microscope allowed for the detailed study of cell membranes.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the invention of a tool that enabled the detailed study of cell membranes.

2. **Evaluating the Options**:
- **Simple Microscope**: This type of microscope has limited magnification and resolution, making it unsuitable for studying detailed structures like cell membranes.
- **Compound Microscope**: While better than a simple microscope, it still does not provide the high resolution needed to see the intricate details of cell membranes.
- **Electron Microscope**: This microscope uses electrons instead of light to create images, allowing for much higher resolution and detail. It was specifically designed to study small structures, including cell membranes.
- **Phase Contrast Microscope**: This type of microscope enhances contrast in transparent specimens but does not provide the high resolution necessary for detailed cellular structures.

3. **Identifying the Correct Answer**: Among the options, the electron microscope is the most advanced and was crucial for studying the detailed structure of cell membranes. It was invented in 1931, and significant studies on cell membranes were conducted in the 1950s using this technology.

4. **Final Answer**: The correct answer is **Electron Microscope**.