Choose the best answer

1			Proteobacteria are gram-negative bacteria of considerable importance as
			A)	disease agents
			B)	nitrogen fixers
			C)	major experimental organisms
			D)	all of these
2			Which of the following genera grow symbiotically within root nodules of legumes as nitrogen-fixing bacteroids?
			A)	Agrobacterium
			B)	Rhizobium
			C)	Pseudomonas
			D)	Bacteroides
3			Mineralization refers to
			A)	the breakdown of organic materials to inorganic materials.
			B)	the release of various minerals from ores.
			C)	the utilization of minerals as energy sources.
			D)	the incorporation of inorganic material into organic materials.
4			Pseudomonads are a large group of bacteria which can
			A)	spoil refrigerated food
			B)	cause disease
			C)	photosynthesize
			D)	a and b
			E)	a and c
5			Rickettsia rickettsii is responsible for
			A)	Q-fever
			B)	Rocky Mountain spotted fever
			C)	Lyme disease
			D)	Typhoid fever
6			Helicobacter pylori is responsible for
			A)	gastroenteritis.
			B)	cholera.
			C)	bacterial dysentery.
			D)	peptic ulcer disease.
7			Whooping cough is caused by
			A)	Klebsiella pneumoniae
			B)	Vibrio parahaemolyticus
			C)	Bordetella pertussis
			D)	Yersinia pestis
8			In which of the following regions in the host bacterium are you most likely to find Bdellovibrio?
			A)	the cytoplasm
			B)	the nucleoid
			C)	the space between the plasma membrane and the cell wall
			D)	the space within the flagella
9			Hyphomicrobium may constitute as much as ____________ of the total bacterial population in oligotrophic (nutrient poor) freshwater habitats.
			A)	10%
			B)	25%
			C)	40%
			D)	60%
10			Bacteria that are capable of bioluminescence have been found in which of the following genera?
			A)	Vibrio
			B)	Photobacterium
			C)	Vibrio and Photobacterium
			D)	neither Vibrio nor Photobacterium
11			Which of the following is true of Agrobacterium tumefaciens?
			A)	It is not capable of nitrogen fixation.
			B)	It causes crown gall disease when it carries a tumor inducing (Ti) plasmid.
			C)	It has been used to introduce foreign DNA into plant cells.
			D)	All of the above are true of Agrobacterium tumefaciens.
12			Which of the following genera fix nitrogen nonsymbiotically?
			A)	Rhizobium
			B)	Nitrosomonas
			C)	Nitrobacter
			D)	Azotobacter
13			The causative agent for cholera in humans is a member of the genus
			A)	Escherichia
			B)	Vibrio
			C)	Enterobacter
			D)	Shigella