Yeast: Difference between revisions
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Yeast is a [[Eukaryotes|eukaryotic]], unicellular [[Organism|organism]] and belongs to the kingdom of [[Fungi|fungi]]. They can be shperical, cylindrical and filamentous, and usually replicate by [[Budding|budding]]. Budding is when a new cell grows out from the old cell, and then separates from each other. Yeasts survive best in conditions with high sugar concentrations, and are able to survive in [[Anaerobic respiration|anaerobically]] and [[Aerobic respiration|aerobically]], meaning that they are [[Faculative aerobes|faculative aerobes]]. | Yeast is a [[Eukaryotes|eukaryotic]], unicellular [[Organism|organism]] and belongs to the kingdom of [[Fungi|fungi]]. They can be shperical, cylindrical and filamentous, and usually replicate by [[Budding|budding]]. Budding is when a new cell grows out from the old cell, and then separates from each other. Yeasts survive best in conditions with high sugar concentrations, and are able to survive in [[Anaerobic respiration|anaerobically]] and [[Aerobic respiration|aerobically]], meaning that they are [[Faculative aerobes|faculative aerobes]].<ref>Brock Biology of Microorganisms, Madigan at al, 11ed. Pearson education, 1970, San Francisco</ref> | ||
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Revision as of 12:53, 23 October 2012
Yeast is a eukaryotic, unicellular organism and belongs to the kingdom of fungi. They can be shperical, cylindrical and filamentous, and usually replicate by budding. Budding is when a new cell grows out from the old cell, and then separates from each other. Yeasts survive best in conditions with high sugar concentrations, and are able to survive in anaerobically and aerobically, meaning that they are faculative aerobes.[1]
Types
Saccharomyces cerevisae (or Baker's yeast) is a common form of yeast often used as a model organism due to it's eukaryotic processes, similar to those of animal cells [2]. This species of yeast replicates by budding. Parent cells in cerevisae can be differentiated by scars formed from budding.
The species Schizosaccharomyces pombe (fission yeast) replicates by elongation then splitting. S. pombe is used in the production of african beer. Breakthroughs in science involve using this model organism to study the checkpoint chemicals used to control the cell cycle which is a major discovery in cancer chemistry.
Another species; Candidia albicans, is responsible for some vaginial, lung and mouth infections, is a filamentous yeast. Its shape is whats allows it to be pathogenic.
References