A gram (+Ve) bacteria differs from a Gram (–ve) bacteria because of

Options

A. Cell membrane
B. Cytoplasm
C. Flagellar
D. Cell wall

Answer

To solve the question about the differences between Gram-positive and Gram-negative bacteria, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Basics of Gram Staining**:
- Gram staining is a method used to classify bacteria into two groups based on the structure of their cell walls.

2. **Identify the Key Components**:
- Both Gram-positive and Gram-negative bacteria have a plasma membrane and cytoplasm.
- The main difference lies in their cell wall structure.

3. **Examine the Cell Wall Structure**:
- **Gram-positive bacteria**: They have a thick peptidoglycan layer in their cell wall, which retains the crystal violet stain used in Gram staining, making them appear purple.
- **Gram-negative bacteria**: They have a thinner peptidoglycan layer and an additional outer membrane composed of lipopolysaccharides and proteins. This structure does not retain the crystal violet stain, leading to a pink appearance after the counterstain is applied.

4. **Analyze the Options Given**:
- Option 1: Cell membrane - Both types have a cell membrane.
- Option 2: Cytoplasm - Both types contain cytoplasm.
- Option 3: Flagellar - Flagella can be present in both types, but they do not differentiate them.
- Option 4: Cell wall - This is the primary difference, as the structure of the cell wall varies significantly between the two types.

5. **Conclusion**:
- The correct answer is **Option 4: Cell wall**. Gram-positive bacteria differ from Gram-negative bacteria primarily due to the structure and composition of their cell walls.