Question

What is the three domain classification?

Answer 1

Hint: Carl Woese established the three-domain method in$$1990$$ , which is why it is known as Carl Woese's Classification. Because it separates living forms into three domains and six kingdoms, this classification system is also known as the Six Kingdoms and Three Domains Classification. This system of classification came after Whittaker gave the Five Kingdom Classification.

Complete answer:
Archaea, bacteria, and eukaryotes are the three domains of Carl Woese's classification scheme, and the six kingdoms are Archaebacteria (ancient bacteria), Eubacteria (real bacteria), Protista, Fungi, Plantae, and Animalia.
This categorization method separates life based on variations in the 16S ribosomal RNA (rRNA) structure, as well as the lipid structure of the cell membrane and antibiotic susceptibility. The separation of Kingdom Monera into Archaea and Bacteria is the most significant difference from previous categorization systems.
Carl Woese utilises $$16S$$ ribosomal RNA (rRNA) as a ‘Chronometer' in this categorization because;
1. It is globally dispersed, implying that it is found in all animals.
2. In all species, it serves the same purpose.
3. It has the ability to modify its sequence gradually.
4. Its sequences may be matched up or aligned between two species.
The three domains given by Carl Woese are as follows –
1. Archaea
2. Bacteria
3. Eukarya

Note:
The similarities in the cell membrane structure of various species, such as bacteria and archaea, which were classed in separate categories, was one of the system's flaws. The feature sequences and polygenies of conserved proteins are not consistent. These were the points that were used to classify creatures based on their evolutionary relationships, but they had no consistency.