The plasma membrane was discovered by whom and in which year?

Options

A. M. Schleiden , 1839
B. T. Swhwann , 1839
C. Robert Hook, 1838
D. Robert brown, 1839

Answer

**Step-by-Step Solution:**

1. **Identify the Scientist**: The question asks who discovered the plasma membrane. The relevant scientist in this context is T. Swan.

2. **Identify the Year of Discovery**: According to historical records, T. Swan discovered the plasma membrane in the year 1839.

3. **Summarize the Information**: Therefore, the plasma membrane was discovered by T. Swan in the year 1839.

4. **Cross-Reference Other Scientists**: To ensure clarity, it's helpful to mention other scientists and their contributions:
- M. Schleiden and T. Schwann together formulated the cell theory in 1838.
- Robert Hooke is known for discovering the cell itself.
- Robert Brown discovered the nucleus of the cell.

5. **Final Answer**: The plasma membrane was discovered by T. Swan in 1839.

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