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Prokaryote: meaning, definitions and examples

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prokaryote

 

[ proˈkær.i.oʊt ]

Noun
Context #1 | Noun

biological classification

A prokaryote is a single-celled organism that lacks a membrane-bound nucleus and other organelles. Prokaryotes are among the earliest forms of life on Earth, encompassing bacteria and archaea. They reproduce asexually through binary fission and have diverse metabolic pathways.

Synonyms

archaeon, bacterium, unicellular organism

Examples of usage

  • Bacteria are classified as prokaryotes.
  • Prokaryotes can survive in extreme environments.
  • The study of prokaryotes is essential in microbiology.

Word origin

The term 'prokaryote' is derived from the Greek words 'pro' meaning 'before' and 'karyon' meaning 'nut' or 'kernel.' This relates to the fact that prokaryotic cells do not have a well-defined nucleus like eukaryotic cells, which contain a membrane-bound nucleus. The concept of prokaryotes was first systematically introduced in the 1960s, when scientists began to distinguish between these simple, unicellular organisms and the more complex eukaryotic cells. This classification reflects the evolutionary perspective on the development of cellular life, emphasizing the fundamental differences in cell structure and function that have shaped the diversity of life on Earth. Prokaryotes, which include bacteria and archaea, are essential for various ecological processes and play crucial roles in nutrient cycling and bioengineering.

Word Frequency Rank

Ranking #39,062, this word is encountered relatively rarely in everyday English. It might appear in literary works or specialized texts but isn't essential for general communication.