Archaea
The Archaea (
i/ɑːrˈkiːə/ or /ɑːrˈkeɪə/ ar-KEE-ə or ar-KAY-ə; singular archaeon) constitute a domain or kingdom of single-celled microorganisms. These microbes are prokaryotes, meaning that they have no cell nucleus or any other membrane-bound organelles in their cells.
Archaea were initially classified as bacteria, receiving the name archaebacteria (in the Archaebacteria kingdom), but this classification is outdated. Archaeal cells have unique properties separating them from the other two domains of life, Bacteria and Eukaryota. The Archaea are further divided into multiple recognized phyla. Classification is difficult because the majority have not been studied in the laboratory and have only been detected by analysis of their nucleic acids in samples from their environment.
Archaea and bacteria are generally similar in size and shape, although a few archaea have very strange shapes, such as the flat and square-shaped cells of Haloquadratum walsbyi. Despite this visual similarity to bacteria, archaea possess genes and several metabolic pathways that are more closely related to those of eukaryotes, notably the enzymes involved in transcription and translation. Other aspects of archaeal biochemistry are unique, such as their reliance on ether lipids in their cell membranes. Archaea use more energy sources than eukaryotes: these range from organic compounds, such as sugars, to ammonia, metal ions or even hydrogen gas. Salt-tolerant archaea (the Haloarchaea) use sunlight as an energy source, and other species of archaea fix carbon; however, unlike plants and cyanobacteria, no known species of archaea does both. Archaea reproduce asexually by binary fission, fragmentation, or budding; unlike bacteria and eukaryotes, no known species forms spores.
Podcasts:
-
by Ark
-
by Ark
-
by Ark
-
by Ark
-
by Ark
-
by Ark
-
by Ark
-
by Ark
-
by Ark
-
by Ark
-
by Ark
-
by Ark
-
by Ark
-
by Ark
-
by Ark
-
by Ark
-
by Ark
-
by Ark
-
by Ark
-
by Ark
-
by Ark
-
by Ark
-
by Erika
-
by Erika
-
by Erika
-
by Erika
-
by Erika
-
by Erika
-
by Erika
-
by Erika
-
by Erika
-
by Erika
-
by Erika
-
by Yuriko
-
by Yuriko
-
by Yuriko
-
by Yuriko
-
by Yuriko
-
by Yuriko
-
by Yuriko
-
by Yuriko
-
by A.r.g.
-
by A.r.g.
-
by A.r.g.
-
by A.r.g.
-
by A.r.g.
-
by Ork
-
by Ork
-
by Ork
-
by Ork
Breaking Up With God
by: ArkAooo-ooooh
Aooo-ooooh
Thought I headed straight
Thought I had it waiting for me
Thought it was my fate
I was only waiting for the sky to fall down
The sword of Damocles
Or at least I thought it was
Had me on my knees
That's when I saw it had the shape of a cross
Aooo-ooooh
I'm ready to give it up (up up up up up up..)
Aooo-ooooh
I heard the call, but I won't follow
'Cause now I'm breaking up with God
I've had it with shame, I've had it with sorrow
Now I'm breaking up with God
And the devil too
Now I wanna dance the night away
Aoooo
Reach my heaven alive
A world that's black and white
Has evil haunting every corner
Demons in the night
And no love, no love for the one who ain't right
Aooo-ooooh
I heard the call, but I won't follow
'Cause now I'm breaking up with God
I've had it with shame, I've had it with sorrow
Now I'm breaking up with God
And the Devil too
Now I wanna dance the night away
Aoooo
Reach my heaven alive
Aaaah aaah aaah
Aaaah aaah aaah
(We'll lead you home...)
Aooo-ooooh
I heard the call, but I won't follow
'Cause now I'm breaking up with God
I've had it with shame, I've had it with sorrow
Now I'm breaking up with God
I heard their call, but I won't follow
'Cause now I'm breaking up with God
I've had it with shame, I've had it with sorrow
Now I'm breaking up with God
And the Devil too
Now I wanna dance the night away
Aoooo
Reach my heaven alive
Aoooo
Now I wanna touch you right away
Aoooo, oooh
Find my own heaven alive
Aooo-ooooh
Latest News for: archaea
Evolution: new mechanisms reveal the proximity between eukaryotes and archaea (École Polytechnique)
- 1