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 (see Fig. 1).
c. The cell walls of Bacteria, unlike the Archaea and the Eukarya, contain peptidoglycan.
What are the characteristics of the three domains?
The three domains include:
Archaea – oldest known domain, ancient forms of bacteria.
Bacteria – all other bacteria that are not included in the Archaea domain.
Eukarya – all the organisms that are eukaryotic or contain membrane-bound organelles and nuclei.
What are the characteristics of Archaea?
Archaea, (domain Archaea), any of a group of single-celled prokaryotic organisms (that is, organisms whose cells lack a defined nucleus) that have distinct molecular characteristics separating them from bacteria (the other, more prominent group of prokaryotes) as well as from eukaryotes (organisms, including plants and
How are organisms in the domain Archaea classified?
Under this system, organisms are classified into three domains and six kingdoms. The domains are Archaea, Bacteria, and Eukarya. The kingdoms are Archaebacteria (ancient bacteria), Eubacteria (true bacteria), Protista, Fungi, Plantae, and Animalia.
What are the characteristics of protists?
Protists are eukaryotes, which means their cells have a nucleus and other membrane-bound organelles. Most, but not all, protists are single-celled. Other than these features, they have very little in common. You can think about protists as all eukaryotic organisms that are neither animals, nor plants, nor fungi.
What are some characteristics that are used to classify organisms into domains and kingdoms?
Domain Eukarya has four Kingdoms: Animalia, Plantae, Fungi, and Protista. They are classified based on the complexity of their cellular organization, their ability to obtain nutrients, and their mode of reproduction. Organisms in Kingdom Animalia are the most complex and are commonly referred to as animals.