Eubacterial cell walls are composed of .........., and a sticky mesh of polysaccharides, a ......, often surrounds the wall :
(a) peptidoglycan: plasma membrane
(b) cellulose, glycocalyx
(c) cellulose, plasma membrane
(d) peptidoglycan: glycocalyx

Options

A. peptidoglycan: plasma membrane
B. cellulose, glycocalyx
C. cellulose, plasma membrane
D. peptidoglycan: glycocalyx

Explanation

To answer the question regarding the composition of eubacterial cell walls, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Composition of Eubacterial Cell Walls**:
- Eubacterial cell walls are primarily composed of **peptidoglycan**. This is a polymer that consists of sugars and amino acids, providing structural strength to the bacterial cell.

2. **Identify the Surrounding Structure**:
- Surrounding the cell wall, there is often a sticky mesh of polysaccharides known as the **glycocalyx**. This structure helps in protection and adherence to surfaces.

3. **Match the Components with the Options Given**:
- Now, let's analyze the options provided:
- (a) peptidoglycan: plasma membrane
- (b) cellulose, glycocalyx
- (c) cellulose, plasma membrane
- (d) peptidoglycan: glycocalyx
- From our identification:
- The cell wall is made of **peptidoglycan**.
- The sticky mesh surrounding it is the **glycocalyx**.

4. **Select the Correct Option**:
- The correct answer that matches our findings is **(d) peptidoglycan: glycocalyx**.

### Final Answer:
**(d) peptidoglycan: glycocalyx**