Saturday, 9 May 2015


This week we learn on archaea . Archaeans can be found in the most extreme environments on the planet which in cold environment, hot environment, high salinity and anaerobic environment.  They  live near rift vents in the deep sea at temperatures well over 100 degrees Centigrade. Others live in hot spring, or in extremely alkaline or acid waters. They have been found inside the digestive tracts of cows, termites, and marine life where they produce methane. They live in the anoxic muds of marshes and at the bottom of the ocean.  

There are three main types of archaea: the crenarchaeota, which are characterized by their ability to tolerate extremes in temperature and acidity. The euryarchaeota, which include methane-producers and salt-lovers  and lastly is theaumarcheota. The unique features of archea is cell wall, membrane lipids , metabolism and genetics. Cell wall of bacteria contain s-layer that different from bacteria s-layer. Archaea membrane has their own features that differentiate it from bacteria that is more complex and less impermeable.
Among these three main types of archaea are some subtypes, which include:
Methanogens— archaeans that produce methane gas as a waste product of their "digestion," or process of making energy.
Halophiles— those archaeans that live in salty environments.
Thermophiles— the archaeans that live at extremely hot temperatures.
Psychrophiles— those that live at unusually cold temperatures.

that is what i can conclude from the notes of archaea . second class we have answer the group quiz on the procaryotic and archea

No comments:

Post a Comment