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In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statement is true about archaea? 

  • Archaea resemble eukarya in all respects

  • Archaea have some novel features that are absent in other prokaryotes and eukaryotes

  • Archaea completely differ from both prokaryotes and eukaryotes

  • Archaea completely differ from prokaryotes

Answer

B.

Archaea have some novel features that are absent in other prokaryotes and eukaryotes

The term archebacteria refer to the ancient origin of this group of bacteria, which seems to have diverged very early from the eubacteria. All archaebacteria share certain key characteristics. 

i) Their cell wall lack peptidoglycan ( an important component of the cell wall of eubacteria).

ii) Lipids in the cell membrane of archaebacteria have a different structure than those in all other organisms.

iii) Archaebacteria have distinct ribosomal RNA sequence.

iv) some genes of archaebacteria possess introns unlike those of other bacteria.

The term archebacteria refer to the ancient origin of this group of bacteria, which seems to have diverged very early from the eubacteria. All archaebacteria share certain key characteristics. 

i) Their cell wall lack peptidoglycan ( an important component of the cell wall of eubacteria).

ii) Lipids in the cell membrane of archaebacteria have a different structure than those in all other organisms.

iii) Archaebacteria have distinct ribosomal RNA sequence.

iv) some genes of archaebacteria possess introns unlike those of other bacteria.