Question

All life can be classified into three domains are?

Answer 1

three distinct domains of organisms in nature: Bacteria, Archaea, and Eukarya. A description of the three domains follows:

1. The Archaea (archaebacteria)

The Archaea possess the following characteristics:

a. Archaea are prokaryotic cells.

b. Unlike the Bacteria and the Eukarya, the Archaea have membranes composed of branched hydrocarbon chains (many also containing rings within the hydrocarbon chains) attached to glycerol by ether linkages

c. The cell walls of Archaea contain no peptidoglycan.
2. The Bacteria (eubacteria)

The Bacteria possess the following characteristics:

a. Bacteria are prokaryotic cells.

b. Like the Eukarya, they have membranes composed of unbranched fatty acid chains attached to glycerol by ester linkages.

c. The cell walls of Bacteria, unlike the Archaea and the Eukarya, contain peptidoglycan.
3. The Eukarya (eukaryotes)

The Eukarya (also spelled Eucarya) possess the following characteristics:

a. Eukarya have eukaryotic cells.

b. Like the Bacteria, they have membranes composed of unbranched fatty acid chains attached to glycerol by ester linkages.

c. Not all Eukarya possess cells with a cell wall, but for those Eukarya having a cell wall, that wall contains no peptidoglycan.

Answer 2

The three-domain system is a biological classification introduced by Carl Woese et al.in 1977[1][2] that divides cellular life forms into archaea, bacteria, and eukaryote domains