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Dec 18, 2016 · In the human gut, bacteria outnumber human cells 10:1. The cell walls of some bacteria contain peptidoglycan, a molecule made of sugars and amino acids that gives the cell wall its structure and is thicker in some bacteria than others.
- Gabe Buckley
Aug 31, 2023 · Bacteria contain rRNA that is unique to the Bacteria as indicated by the presence molecular regions distinctly different from the rRNA of Archaea and Eukarya. Bacteria include mycoplasmas, cyanobacteria, Gram-positive bacteria, and Gram-negative bacteria.
- 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 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.
- 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.
Bacteria do contain bacterial microcompartments (BMCs), but these are made up entirely of protein and are not surrounded by a phospholipid membrane. These function for example in CO2 fixation to sequester metabolites toxic to the cells.
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Mar 31, 2024 · Bacteria and Archaea are domains that consist exclusively of microorganisms. Eukaryota includes the macroorganisms (e.g., you are a eukaryote) but also multiple groups that contain microorganisms, including the fungi, protozoa, and algae.
