Q. 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?
A) Archaea resemble eukarya in all respects
B) Archaea have some noble features that are absent in other prokaryotes and eukaryotes
C) Archaea completely differ from both prokaryotes and eukaryotes
D) Archaea completely differ from prokaryotes
Explanation
All archaebacteria share certain key characteristics: (i) Their cell wall lack peptidoglycan (important component of cell wall of eubacteria). (ii) Lipids in cell membrane of archaebacteria have different structure than those in all other organisms (iii) Archaebacteria has distinct ribosomal RNA sequence. (iv) Some genes of archaebacteria possess, introns unlike those of other bacteria.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.