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Archea
A phylogenetic domain of prokaryotes consisting of the methanogens, most extreme halophiles and hyperthermophiles, and extreme acidophiles such a Thermoplasma.
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Autotroph
An organism able to grow on CO2 (Carbon Dioxide) as sole source of carbon.
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Bacteria
All prokaryotes that are not members of the domain Archaea.
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Cell Wall
A rigid layer present outside the cytoplasmic membrane that confers structural strength on the cell and protection from osmotic lysis.
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Chemolithotroph
An organism that obtains its energy from the oxidation of inorganic compounds.
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Chromosome
A genetic element carrying genes essential to cellular function. Prokaryotes typically have a single chromosome consisting of a circular DNA molecule. Eukaryotes typically have several chromosomes, each containing a linear DNA molecule.
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Cyanobacteria
Prokaryotic oxygenic phototrophs containing chlorophyll a and phycobilins.
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Cytoplasm
The fluid portion of a cell, bounded by the cell membrane.
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Cytoplasmic Membrane
A semipermeable barrier that separates the cell interior (cytoplasm) from the environment,
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Domain
The highest level of biological classification. The three domains of biological organisms are the Bacteria, the Archaea, and the Eukarya. Also, used to describe a region of a protein having a defined structure and function.
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Endosymbiosis
The engulfment of one cell type by another cell type and the subsequent and stable association of the two cells.
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Eukarya
The phylogenetic domain containing all eukaryotic organisms.
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Eukaryote
A cell or organism having a unit membrane-enclosed nucleus and usually other organelles; a member of the Eukarya.
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Evolution
Descent with modifications; DNA sequence variation and the inheritance of that variation.
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Extremophile
An organism that grows optimally under one or more chemical or physical extremes, such as high or low temperature of pH,
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Genome
The total complement of genetic information of a cell or a lyzing genomes.
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Gram Stain
A differential staining technique in which cells stain either pink (gram-negative) or purple (gram-positive), depending upon their structural and phylogenetic makeup.
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Gram-positive Bacteria
Major phylogenetic lineage of prokaryotic cells that contains mainly peptidoglycans in their cell walls; stain purple in the Gram stain.
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Gram-negative Bacteria
A prokaryotic cell whose cell wall contains relatively little peptidoglycan but has an outer membrane composed of lipopolysaccharide, lipoprotein, and other complex macromolecules.
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Heterotroph
An organism that requires organic carbon as its carbon source; also a chemoorganotroph.
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Nucleoid
The aggregated mass of DNA that makes up the chromosome of prokaryotic cells.
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Nucleus
A membrane-enclosed structure in eukaryotes containing the genetic material (DNA) organized in chromosomes.
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Organelle
A unit membrane-enclosed structure such as the mitochondrion found in eukaryotic cells.
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Phototroph
An organism that obtains energy from light.
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Phylogeny
The evolutionary (natural) history of organisms.
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Plasmid
An extrachromosomal genetic element that is not essential for growth and has no extracellular form.
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Prokaryote
A cell or organism lacking a nucleus and other membrane-enclosed organelles and usually having its DNA in a single circular molecule. Members of the Bacteria and the Archaea.
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Proteobacteria
A large phylum of Bacteria that includes many of the common gram-negative bacteria, including Escherichia coli.
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Resolution
In microbiology, the ability to distinguish two objects as distinct and separate under the microscope.
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Ribosome
Structure composed of RNAs and proteins upon which new proteins are made.
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Virus
A genetic element containing either RNA or DNA and that replicates in cells; has an extracellular form.
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Chemooganotroph
An organism that obtains its energy from the oxidation of organic compounds.
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