The cell envelop in bacteria consists of :-

Options

A. Loosely bound three layered structures
B. Tightly bound three layered living structures
C. Tightly bound three layered non-living and living structures
D. Tightly bound three layered nonliving structures

Answer

To answer the question regarding the composition of the cell envelope in bacteria, we can break down the information as follows:

### Step-by-Step Solution:

1. **Understanding the Cell Envelope**: The cell envelope in bacteria is a critical structure that surrounds the bacterial cell. It provides protection and structural support.

2. **Layers of the Cell Envelope**: The cell envelope is described as a multi-layered structure consisting of three main layers:
- **Outer Membrane**: This is the outermost layer that contains phospholipids and proteins. It serves as a barrier to certain substances and is more prominent in Gram-negative bacteria.
- **Peptidoglycan Layer**: The middle layer is composed of peptidoglycan, which is a polymer that provides rigidity and strength to the cell wall. This layer is essential for maintaining the shape of the bacteria.
- **Cytoplasmic Membrane**: The innermost layer is the cytoplasmic membrane, which is a living structure that regulates the entry and exit of substances into and out of the cell.

3. **Nature of the Cell Envelope**: The cell envelope consists of both living (cytoplasmic membrane) and non-living (outer membrane and peptidoglycan) components. This dual nature is important for the overall function of the bacteria.

4. **Final Conclusion**: Therefore, the cell envelope in bacteria consists of a tightly bound, three-layered structure that includes both living and non-living components.

### Answer:
The cell envelope in bacteria consists of a tightly bound, three-layered structure that includes living and non-living components.