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Oct 4, 2019 · Bacteria are single-celled microorganisms with prokaryotic cells, which are single cells that do not have organelles or a true nucleus and are less complex than eukaryotic cells. Bacteria with a capital B refers to the domain Bacteria, one of the three domains of life.
Feb 2, 2023 · What is bacteria and how the cell looks like under a microscope: learn its facts, types, characteristics, structure, & reproduction using examples & labeled picture
- Domain Bacteria (Kingdom: Eubacteria (True bacteria)) Bacteria are unicellular prokaryotic microscopic organisms. Their unique feature covers the presence of peptidoglycan in the cell wall unlike the Archaea and Eukarya, membrane composed of unbranched fatty acid chains attached to glycerol by ester linkages and their unique rRNA type.
- Domain Archaea (Kingdom: Archaebacteria) These are unicellular prokaryotic organisms that resemble bacteria in their appearance, and hence were fallaciously placed under bacteria before the rise of three domain systems.
- Domain Eukarya. Eukarya is the only domain that represents multicellular, nucleated, and visible organisms with distinct membrane-bound cell organelles although single-celled eukarya also exist.
- Archaea. Organisms within this domain are sometimes referred to as the extremophile prokaryotes, archaea were first discovered living in extreme environments, but not all archaea do.
- Bacteria. These are organisms that have prokaryotic cells which contain no nucleus. They vary in size over a wide range: the smallest are bigger than the largest known-viruses and the largest are smaller that the smallest known single-celled eukaryotes.
- Eukarya. Organisms that have eukaryotic cells with nuclei and membrane-bound organelles are placed in this domain. They vary massively in size from single-celled organisms several micrometres across to large multicellular organisms many-metres in size, such as blue whales.
- Domain Archaea. The Archaea domain includes all prokaryotic cells, they lack nuclear membrane; have distinct biochemistry; contain RNA markers from bacterial cells.
- Domain Bacteria. These are also prokaryotic cells with bacterial rRNA and contain diacyl glycerol diester lipids in their membrane. They are also called eubacteria or “true bacteria”.
- Domain Eukarya. These are eukaryotic cells with a membrane-bound nucleus. Their membranes contain their membranes between unbranched fatty acid chains and glycerol.
Mar 28, 2024 · According to the tenets of the domain system, the intricate tapestry of life can be distilled into three principal domains: Archaea, Bacteria, and Eukarya. These domains represent vast assemblages of organisms sharing fundamental characteristics and tracing their lineage through evolutionary histories.
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