How many layers are there in te cell envelope of Gram (-) ve bacteria

Options

A. 2
B. 3
C. 4
D. 6

Answer

To determine how many layers are present in the cell envelope of Gram-negative bacteria, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Bacterial Cells**:
- Bacteria have a cell envelope that typically consists of a cell membrane and a cell wall.

2. **Differentiate Between Gram-positive and Gram-negative Bacteria**:
- Gram-positive bacteria have a simpler structure with two layers: the cell membrane and a thick cell wall.
- Gram-negative bacteria have a more complex structure.

3. **Identify the Layers in Gram-negative Bacteria**:
- In Gram-negative bacteria, the cell envelope consists of three distinct layers:
- **Inner Membrane (Cell Membrane)**: This is the innermost layer.
- **Peptidoglycan Layer (Cell Wall)**: This is a thin layer located between the inner membrane and the outer membrane.
- **Outer Membrane**: This is the outermost layer, which is often referred to as the glycolax.

4. **Count the Layers**:
- By counting the layers in the Gram-negative bacteria, we find:
- Inner Membrane
- Peptidoglycan Layer
- Outer Membrane
- This totals to three layers.

5. **Select the Correct Option**:
- Based on the counting, the answer to the question is option B, which states that there are 3 layers in the cell envelope of Gram-negative bacteria.

### Final Answer:
The cell envelope of Gram-negative bacteria has **3 layers**.