Question
Biology Question on biological classification
Archaebacteria differ from eubacteria in
cell membrane structure
mode of nutrition
cell shape
mode of reproduction.
cell membrane structure
Solution
Archaebacteria differ from eubacteria in cell membrane structure.
The archaebacteria are considered to be the 'ancient' bacteria that comprise extremophiles like methanogens, halophiles, and thermophiles. They represent some of the most ancient life forms that continue to exist today. Generally, archaebacteria have the same shape, size, nutrition, and appearance as bacteria. They multiply by the means of binary fission.
However, archaebacteria cell walls lack peptidoglycan. They also have different membrane lipid bonds in comparison to bacteria and eukarya. Archea membrane lipids have ether bonds whereas bacteria have ester-linked lipids.
Therefore, the correct answer is option A.