-
Archaea used to be considered a bacteria until what difference was discovered by Carl Woese?
Discovered that the rRNA sequences were difference between Archaea and Bacteria.
*Chose to compare rRNA because ANY changes in rRNA probably occur at a slow, steady pace as evolution occurs.
-
Which are believed to be more closely related to Archaea?
A. Domain Bacteria
B. Domain Eukarya
B. Domain Eukarya
-
What are the similarities between Archaea and Eukarya?
Hint: There are 3 similarities
- Share some of the same ribosomal proteins (not found in bacteria)
- initiate transcription in the same manner
- have similar types of tRNA
-
What is the plasma membrane of an archaea cell made up of?
Contains glycerol linked to BRANCHED-CHAIN hydrocarbons
-
What is the difference between the plasma membrane of an archaea and a bacteria?
- Bacteria's plasma membrane: glycerol linked to fatty acids (no branches!)
- Archaea's plasma membrane: glycerol linked to branched chain hydrocarbons
-
The cell wall of an archaea are made up of _____________.
Polysaccharides
-
What is the difference between the cell wall of an archaea and a bacteria?
- Bacteria-peptidoglycans
- Archaea-polysaccharides
-
All Archaea have a cell wall.
A. True
B. False
- False.
- Very few do not have a cell wall
-
What is methanogenesis?
-The ability to form methane
**Methanogenesis is a type of metabolism only Archaea can perform!
-
Some Archaea can be considered photosynthetic.
A. True
B. False
- False!
- NO ARCHAEA ORGANISM CAN PERFORM PHOTOSYNTHESIS -> (cannot convert solar energy into chemical energy).
-
Most Archaea are chemoautotrophs.
A. True
B. False
-
Archaea can sometimes be __________.
- D. A and B only
- Archaea can be mutualistic or even commensalistic, but NEVER parasitic!
- ARCHAEA ARE NOT KNOWN TO CAUSE INFECTIOUS DISEASES.
-
What kind of habitats do methanogens live in ?
- Found in anaerobic environments
- swamps, marshes, intestinal tracts of animals
Methanogens produce methane from Hydrogen Gas, and CO2 coupled to the formation of ATP
*Methane (also called biogas) is released into the atmosphere and contributes to the greenhouse effect and global warming. - About 65% of the methane found in our atmosphere is produced by these methanogenic archaea.
-
What kind of habitat are halophiles found in ?
- Live in High Salt Concentrations. (12-15%[NaCl]) (Seawater is about 3.5%)
- Found in Great Salt Lake of Utah, Dead Sea.
-
What type of habitat do thermoacidophiles tlive in ?
- -extremely hot, acidic environments
- -Ex: hot springs, geysers, submarine thermal vents, around volcanoes.
- -They reduce sulfides and survive best in temp above 80 Celsius.
- -Metabolism of sulfide results in acidic sulfates--grow best at pH 1-2.
|
|
