Mark the following statement as True or False:
The cell membrane is impermeable.

Answer

**Step-by-Step Solution:**

1. **Understanding the Cell Membrane**: The cell membrane is the outer boundary of a cell that separates the inside of the cell from the external environment. It is crucial for maintaining the cell's integrity and regulating what enters and exits the cell.

2. **Nature of the Cell Membrane**: The cell membrane is composed of lipids and proteins, making it a lipoprotein structure. This composition allows it to perform various functions, including selective permeability.

3. **Selective Permeability**: The term "selectively permeable" means that the cell membrane allows certain substances to pass through while blocking others. This is essential for the cell to maintain homeostasis and control its internal environment.

4. **Examples of Permeability**: Water and certain solute molecules can pass through the cell membrane. This indicates that the cell membrane is not impermeable; rather, it selectively allows specific substances to enter or exit.

5. **Conclusion**: Since the statement claims that the cell membrane is impermeable, and we have established that it is actually selectively permeable, the statement is false.

**Final Answer**: The statement "The cell membrane is impermeable" is **False**.

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