A prokaryote (/ proʊˈkærioʊt, - ət /; less commonly spelled procaryote) [1] is a microorganism whose usually single cell lacks a nucleus or other membrane-bound organelles. [2] The word prokaryote …

Nov 20, 2025 · Prokaryote, any organism that lacks a distinct nucleus and other organelles due to the absence of internal membranes. Bacteria are among the best-known prokaryotic organisms.

Feb 2, 2023 · ‘Pro’ means ‘before’ and ‘kary’ means ‘nucleus’. Prokaryotes are simple, single-celled organisms that are the most primitive life form on earth. It includes two domains – bacteria and archaea.

Jun 14, 2023 · A prokaryotic cell is a type of cell that lacks a defined nucleus and other membrane-bound organelles. These cells are structurally simpler and smaller than their eukaryotic counterparts, …

May 24, 2024 · Prokaryotes are single-celled organisms that are the earliest and most primitive forms of life on Earth. As organized in the Three Domain System, prokaryotes include bacteria and …

Jan 30, 2025 · Prokaryotes are small, single-celled organisms with a simple structure. Unlike other cells, they don’t have a nucleus or other membrane-bound organelles.

Jul 22, 2022 · A prokaryote is defined as any organism that is chiefly characterized by a cell devoid of a well-defined (i.e., membrane-bound) nucleus as opposed to a eukaryote that has a nucleus.

A prokaryote is a simple, mostly single-celled (unicellular) organism that lacks a nucleus, or any other membrane-bound organelle. We will shortly come to see that this is significantly different in …

The name “prokaryote” suggests that prokaryotes are defined by exclusion—they are not eukaryotes, or organisms whose cells contain a nucleus and other internal membrane-bound organelles.

Jul 26, 2025 · Prokaryotes represent a fundamental category of life forms, distinguished by their cellular organization. These microscopic organisms are single-celled and lack the complex internal …