Britannica
Sources used in this answer
Which cell features make archaea prokaryotes?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
Archaea
Archaea are found in a diverse range of extreme environments, including the salt deposits on the shores of the Dead Sea.
Archaea are classified as prokaryotes primarily because their cellular structure lacks a defined nucleus and other membrane-enclosed intracellular organelles, which are characteristic features of eukaryotic cells.12
Beyond the absence of a nucleus, archaea share several fundamental features with bacteria that define them as prokaryotic organisms:
- Genetic Material: Like bacteria, archaea possess circular DNA rather than the multiple linear chromosomes found in eukaryotes.2
- Cellular Design: They exhibit a simpler, generally smaller cellular design compared to eukaryotes, lacking specialized structures like the endoplasmic reticulum, Golgi apparatus, mitochondria, or chloroplasts.2
While archaea are grouped with bacteria as prokaryotes due to these shared structural simplifications, they are genetically and biochemically distinct from bacteria. They possess unique molecular characteristics—such as specific cell wall compositions and ether-linked membrane lipids—that distinguish them as a separate domain of life.12