Prokaryotes have diversified greatly throughout their long existence. Their metabolism is far more varied than that of eukaryotes, leading to many highly distinct types.

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 …

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 …

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

Prokaryotes are small and lack membrane-bound nuclei. Prokaryotic cells comprise bacteria and archaea. Their genetic material isn’t stored within a membrane-bound nucleus. Instead, it is …

Prokaryotes (domains Archaea and Bacteria) are single-celled organisms lacking a nucleus. They have a single piece of circular DNA in the nucleoid area of the cell.

Prokaryotes are organisms whose cells lack a nucleus and other organelles. This class of organisms includes all of the bacteria.

Prokaryotes (from Greek: pro- “before” + karyon “nut,” referring to the cell nucleus, + suffix -otos, pl. -otes; also spelled "procaryotes") are organisms without a cell nucleus (= karyon), or …

Cells fall into one of two broad categories: prokaryotic and eukaryotic. We classify only the predominantly single-celled organisms Bacteria and Archaea as prokaryotes (pro- = “before”; …

Prokaryotes were the first forms of life on Earth, and they existed for billions of years before plants and animals appeared. The Earth and its moon are thought to be about 4.54 billion years old.