prokaryote
Noun: * A prokaryote is a microscopic, single-celled organism whose cell lacks a distinct, membrane-bound nucleus (karyon) and other membrane-bound organelles. Its genetic material (DNA) is typically a single, circular chromosome located in a region of the cell called the nucleoid. Bacteria and archaea are the two primary domains of prokaryotic life.
- Noun:
- A prokaryote reproduces asexually through a process called binary fission.
- The earliest forms of life on Earth are believed to have been simple prokaryotes.
- Unlike animal and plant cells, a prokaryote does not have mitochondria.
- "Prokaryotic" (adjective): Describing the characteristics of a prokaryote.
- Prokaryotic cells are generally smaller and less structurally complex than eukaryotic cells.
- In scientific classification, the term is used contrastively with "eukaryote".
- The fundamental division in cellular life is between prokaryotes and eukaryotes.
- Prokaryotic (adj): Of or relating to a prokaryote; having cells without a membrane-bound nucleus.
- Bacteria have a prokaryotic cell structure.
- Eukaryote (n): An organism whose cells contain a nucleus surrounded by a membrane and other membrane-bound organelles. This is the direct antonym in biological taxonomy.
- Animals, plants, and fungi are all eukaryotes.
- Prokaryotic organism: A more descriptive synonym.
- Moneran (historical/less common): A term formerly used in some classification systems to group bacteria and similar organisms.
The definition of prokaryote is precise and scientific. Its core meaning is defined by the absence of specific cellular structures (membrane-bound nucleus and organelles). It is a categorical term in biology and is not typically used in metaphorical or non-scientific contexts. The provided reference context correctly identifies bacteria as the prime example and includes other groups like cyanobacteria (blue-green algae).
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a unicellular organism having cells lacking membrane-bound nuclei; bacteria are the prime example but also included are blue-green algae and actinomycetes and mycoplasma
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