Summary
Prokaryotes distinct from bacteria, often thriving in extreme environments like hot springs and salt lakes.
In depth
Archaea share features with both bacteria (prokaryotic organisation) and eukaryotes (histone-like proteins, similar transcription machinery). Their membranes contain ether-linked lipids and their walls lack peptidoglycan. Includes methanogens, halophiles and thermophiles.
Eukaryotes are thought to have arisen from within the archaea (Asgard group).
Archaeal membranes with ether bonds resist extremes. Many archaea are not extremophiles; some live in soil and oceans. Archaea are not known to cause disease in humans.
Remember: archaea resemble bacteria in shape but not in biochemistry.
Frequently asked questions
What is Archaea?
Prokaryotes distinct from bacteria, often thriving in extreme environments like hot springs and salt lakes.
Which area of biology covers Archaea, and how advanced is it?
Archaea is one of the 54 topics in Microbiology. It is rated Beginner, so it suits learners who are starting out in biology. Related topics in this area include Extremophiles, Bacteria, Microorganisms.
Can you give an example of Archaea?
Halobacterium lives in salt flats using bacteriorhodopsin.
What should I learn before Archaea?
Archaea is a Beginner topic, so no earlier topic is required. Other Beginner topics in Microbiology that pair well with it include Microorganisms, Bacteria, Bacterial Shapes.
What topics are related to Archaea?
The closest topics to Archaea are Extremophiles, Bacteria, Microorganisms, Bacterial Cell Wall. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Archaea?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Archaea. To practise the whole of Microbiology, use the Microbiology quiz.
How is Archaea different from Extremophiles?
Archaea: Prokaryotes distinct from bacteria, often thriving in extreme environments like hot springs and salt lakes. Extremophiles: Organisms thriving in extremes of heat, acidity, salt or pressure, with specialised enzymes. Read both side by side and note what each one explains.
How should I study Archaea step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Extremophiles and explain the difference aloud. Finally, take the Microbiology quiz and come back to this page for any question you miss.