Thermophiles live in hot water environments in acid sulfur springs. Halophiles live in water with high concentrations of salts. Methanogens are found in oxygen-free environments like marshes, lake sediments and digestive tracts of animals, producing methane gas. Three types of archaebacteria are found: methanogens, halophiles and thermophiles. Archaebacterial genome consists of a single circular chromosome, which exhibits transcription and translation similar to eukaryotes. According to the structure of cell wall, archaebacteria are more similar to gram positive bacteria. The membrane lipids of archaebacteria are ether-linked, branched aliphatic chains, containing D-glycerol phosphates. The cell wall of archaebacteria is made up of pseudo peptidoglycans. Different shapes are processed by archaebacteria like spheres, rods, plates and spirals. Individual archaebacterium is 0.1-15 μm in diameter. Asexual reproduction of archaebacteria is identified, occurring by binary fission, budding and fragmentation. Archaebacteria are metabolically diverse, using a variety of substrates as their energy and carbon sources. Their pathogenic or parasitic effect is still not observed. Archaebacteria play a vital role in carbon cycle and nitrogen cycle. They are also found in human skin, oral cavity and colon as well. Archaebacteria are found in hot springs, salt lakes, oceans, marshlands and soils. Archebacteria are considered to be evolved just after the first life on earth. ![]() What is the difference between Archaebacteria and Eubacteria What is ArchaebacteriaĪrchaebacteria are the single-celled microorganisms, living in extreme environments. – Characteristics, Classification, Types, Examplesģ. The main difference between archaebacteria and eubacteria is that archaebacteria are usually found in extreme environmental conditions whereas eubacteria are found everywhere on earth. Both archaebacteria and eubacteria are single-celled microorganisms, which are usually called prokaryotes. Bacteria that use decaying life forms as a source of energy are called saprophytes.Main Difference – Archaebacteria vs EubacteriaĪrchaebacteria and eubacteria are two domains of the kingdom: Monera, which contains the least organized unicellular prokaryotic microorganisms on earth. ![]() Heterotrophs obtain their energy by consuming other organisms. Autotrophs make their own food by using the energy of sunlight or chemical reactions, in which case they are called chemoautotrophs. Bacteria can be further divided based on their response to gaseous oxygen into the following groups: aerobic (living in the presence of oxygen), anaerobic (living without oxygen), and facultative anaerobes (can live in both environments).Īccording to the way they obtain energy, bacteria are classified as heterotrophs or autotrophs. ![]() The difference in their cell wall structure is a major feature used in classifying these organisms.Īccording to the way their cell wall structure stains, bacteria can be classified as either Gram-positive or Gram-negative when using the Gram staining. Most bacteria have a peptidoglycan cell wall they divide by binary fission and they may possess flagella for motility. They exist in four major shapes: bacillus (rod shape), coccus (spherical shape), spirilla (spiral shape), and vibrio (curved shape). The cells are described as prokaryotic because they lack a nucleus. \( \newcommand\)īacteria are unicellular organisms.
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