Question

Which statement is true about domain archaea?
A) They differ from both prokaryotes and eukaryotes
B) They completely differ from prokaryotes
C) They resemble eukarya in all aspects
D) They have some novel features absent in other prokaryotes and Eukaryotes

Answer 1

Hint: Archaebacteria are placed in different kingdoms from plants and animals. They have some properties which are not common to the organisms placed in bacteria and eukaryotes.

Complete Answer:
- Domain archaea have single-celled microorganisms. They are prokaryotes.
- They do not have well-defined nuclei.
- They do not have membrane-bound organelles.
- They lack peptidoglycan in the cell wall.
- However, they have some novel features absent in other prokaryotes and eukaryotes.
- Instead of ester bonds like in prokaryotes and eukaryotes, they have ether bonds connecting fatty acids to molecules of glycerol.

The correct option is D.

Note: - Archaea domains have methanogens which produces methane gas.
- Also cell walls do not have peptidoglycan and lipids.
- Due to their cell wall structure they are responsible for survival in extreme conditions.
Archaea are considered to be primitive than Eubacteria (i..e true bacteria).