Select the wrong statement

Options

A. Red sea is named after the colouration provided by blue green algae Trichodes- miumerythraeum
B. Spirullina has a spirally coiled filament
C. Peptidoglycan is the main component of the archaebacterial cell wall
D. All of the above

Answer

To solve the question of selecting the wrong statement regarding the characteristics of certain bacteria, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Analyze the First Statement**:
- The first statement claims that the Red Sea is named after the coloration provided by the blue-green algae, specifically Trichodesmium erythraeum.
- This is correct because Trichodesmium erythraeum is indeed a cyanobacterium that can produce a reddish hue in the water, contributing to the name of the Red Sea.

2. **Analyze the Second Statement**:
- The second statement states that Spirulina has spirally coiled filaments.
- This is also correct. Spirulina is a type of cyanobacteria that is known for its spiral shape and is often consumed as a dietary supplement.

3. **Analyze the Third Statement**:
- The third statement mentions that peptidoglycan is the main component of the archaebacterial cell wall.
- This statement is incorrect. Peptidoglycan is primarily found in the cell walls of Eubacteria (true bacteria), while Archaebacteria have cell walls made up of pseudomurein or other polysaccharides, not peptidoglycan.

4. **Analyze the Fourth Statement**:
- The fourth statement is a summary that states all of the above two statements are correct.
- Since we have identified the third statement as incorrect, this summary cannot be true.

### Conclusion:
- The wrong statement is: **"Peptidoglycan is the main component of archaebacterial cell wall."**