Question

What of the following characteristic is true for archaebacteria?
$\left(1\right)$ Extreme halophiles
$\left(2\right)$ Extreme thermophiles
$\left(3\right)$ Methanogens
$\left(4\right)$ Occurrence of peptidoglycan in the cell wall

• A. 1, 2 and 3 are correct
  
• B. 1 and 2 are correct
  
• C. 2 and 4 are correct
  
• D. 1 and 3 are correct
  

Answer 1

The correct option is A 1, 2 and 3 are correct

Peptidoglycan is a polymer that is present in the cell wall of most bacteria. It is also called as Murein. However, Archaebacteria are devoid of peptidoglycan in its wall. Instead, they are made up of the polysaccharide called pseudomurein. Arachebacteria consists of 3 groups, namely halophiles, thermophiles and methanogens.

Thus, the correct answer is '1, 2 and 3 are correct.'