Question

What are the three domains of life?

Answer 1

Domains of life:

1. Carl Woese's six kingdom classification is his own. Because it divides life forms into three categories, this classification method is also known as the "Three Domains Classification." Organisms are divided into six kingdoms and three realms according to this taxonomy.
2. The three domains of life are Archaea, Bacteria, and Eukarya.

Domain Archaea:

1. Prokaryotic cell-containing organisms are found in the domain archaea.
2. Nuclear membranes are absent. They have bacterial cell RNA markers in them.
3. The name "archaea" comes from an ancient Greek word that means "ancient things," and it refers to the earliest species of life on Earth.
4. They have a unique cell wall that allows them to thrive in extreme and hostile settings. Archaea's cell wall is devoid of peptidoglycan.
5. Examples: Archaea are divided into three phyla:- Crenarchaeota, Euryarchaeota, Korarchaeota

Domain Bacteria:

1. Prokaryotic cells are also seen in domain bacteria.
2. They are also referred to as real bacteria or eubacteria.
3. Peptidoglycan makes up their cell wall. Unbranched fatty acid chains and glycerol form an ester bond to form their cell membrane.
4. Examples: There are 5 phyla of the bacterial domain: Proteobacteria, Cyanobacteria, Eubacteria, Chlamydias, Spirochaetes

Domain Eukarya:

1. Prokaryotic cells are also seen in domain bacteria.
2. They are also referred to as real bacteria or eubacteria.
3. Peptidoglycan makes up their cell wall. Unbranched fatty acid chains and glycerol form an ester bond to form their cell membrane.
4. Examples: The domain Eukarya is divided into four kingdoms: Protista, Fungi, Plantae, and Animalia.