Question

In the light of recent classification of living
organisms into three domains of life (bacteria,
archaea and eukarya), which one of the following
statements is true about archaea?
(a) Archaea resemble eukarya in all respects.
(b) Archaea have some novel features that are
absent in other prokaryotes and eukaryotes.
(c) Archaea completely differ from both
prokaryotes and eukaryotes.
(d) Archaea completely differ from prokaryotes.

Answer 1

Answer:

d- archaea completely differ from prokaryotes

Answer 2

In light of current classification of living organisms into the three domains of life the (b) Archaea have some novel features that are  absent in other prokaryotes and eukaryotes.

• Archaebacteria represent a type of cell which appears to possess both prokaryote and eukaryote characteristics.
• In size, the archaebacteria are around one in diameter, and the size of typical prokaryotes is absent from membrane-bound organelles. The nuclear bodies are also not bound by nuclear membranes.
• They have special cell walls that lack peptidoglycan, closely resembling the eukaryotic cells in the protein synthesis pathways.
• The presence of introns is a very distinctive feature of archeabacterial genes, as it is an element that is completely unknown in other prokaryotes, although fairly normal in eukaryotes