4. Cell wall is a term used to describe the cell membrane.

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The statement "**Cell wall is a term used to describe the cell membrane**" is **incorrect**. Here's why:

### **Cell Membrane vs. Cell Wall**

1. **Cell Membrane (Plasma Membrane):**
   - **Presence:** Found in **all** living cells, including animals, plants, fungi, and bacteria.
   - **Structure:** Composed primarily of a phospholipid bilayer with embedded proteins.
   - **Function:** 
     - Acts as a selective barrier controlling the entry and exit of substances.
     - Facilitates communication and signaling between the cell and its environment.
     - Maintains the cell's integrity by providing flexibility.

2. **Cell Wall:**
   - **Presence:** Found in **plants, fungi, bacteria, algae, and some protists**. **Not present** in animal cells.
   - **Structure:** 
     - In plants: Primarily made of cellulose.
     - In fungi: Composed of chitin.
     - In bacteria: Consists of peptidoglycan.
   - **Function:**
     - Provides **rigidity and structural support**, helping the cell maintain its shape.
     - Protects against mechanical stress and osmotic pressure.
     - In plants, it also plays a role in growth by regulating cell expansion.

### **Key Differences:**
- **Composition:** Different materials make up the cell membrane and cell wall.
- **Presence Across Organisms:** All cells have a cell membrane, but only specific groups have a cell wall.
- **Functionality:** While both provide protection, the cell membrane is involved in transport and signaling, whereas the cell wall offers structural support.

### **Conclusion:**
The **cell membrane** and the **cell wall** are **distinct structures** with different compositions and functions. Therefore, the cell wall is **not** a term used to describe the cell membrane.

**Answer:**

No, the statement is incorrect. The cell wall and cell membrane are distinct structures with different functions.
The cell wall and cell membrane are different. The cell wall provides support and is found in plants and some other organisms, while the cell membrane controls what goes in and out of the cell and is present in all living cells.

Cell wall is a term used to describe the cell
membrane.

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