Halobacterium salinarum and certain other extreme halophiles carry out light-driven synthesis of ATP under what condition?
A) low oxygen concentrations
B) low light
C) high oxygen concentrations
D) high carbon dioxide concentrations
Cellular integrity and cell wall stabilization of the Halobacterium are aided by
A) potassium ions.
B) chloride ions.
C) magnesium ions.
D) sodium ions.
One factor that seems to aid in maintaining lipid stability in hyperthermophilic Archaea is that dibiphytanyl tetraether lipids form a(n)
A) covalently bonded monolayer cytoplasmic membrane.
B) interlocking bilayer cytoplasmic membrane.
C) interlocking lattice with the cell wall.
D) pseudomembrane immediately inside the cytoplasmic membrane.
The presence of genes encoding RubisCO enzymes in Methanocaldococcus jannaschii and a species of Pyrococcus indicates that the organisms
A) incorporate carbon dioxide via the acetyl-CoA pathway.
B) incorporate carbon dioxide via the Calvin cycle.
C) incorporate carbon dioxide via the reverse citric acid cycle.
D) utilize molecular hydrogen as an electron donor in chemolithotrophic metabolism.
What is the minimum concentration of sodium chloride that an extreme halophile requires for growth?
A) 2 M
B) 4 M
C) 6 M
D) 10 M
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