Choose the best answer

1			Archaea usually grow in a few restricted or specialized habitats, such as
			A)	anaerobic
			B)	hypersaline
			C)	extremely hot
			D)	extremely cold
			E)	all of these
2			Methanogenic bacteria are archaea that are
			A)	strict anaerobes that obtain energy through the synthesis of methane.*
			B)	strict anaerobes that obtain energy through the consumption of methane.
			C)	strict aerobes that obtain energy through the synthesis of methane.
3			The archaea lack which of the following that are normally found in gram-negative bacteria?
			A)	outer membrane
			B)	a complex peptidoglycan network
			C)	they lack both outer membrane and a complex peptidoglycan network
			D)	they lack neither outer membrane nor a complex peptidoglycan network
4			Which of the following is currently the largest group of archaea?
			A)	extreme halophiles
			B)	methanogens
			C)	extreme thermophiles
			D)	sulfate reducers
5			Methanogens are potentially of great importance because
			A)	they produce methane.
			B)	they consume methane.
			C)	methane is an excellent energy source.
			D)	both a and c
			E)	both b and c
6			Archaea may constitute up to __________% of the procaryotic biomass in Antarctic surface waters.
			A)	23
			B)	28
			C)	34
			D)	43
7			Which of the following have been suggested to be among the first living organisms to have developed?
			A)	Methanococcus
			B)	Methanopyrales
			C)	Methylococcus
			D)	None of the above is correct.
8			Extreme halophiles are found in
			A)	animal intestines
			B)	salt lakes
			C)	the Antarctic ice mass