The mechanism whereby Rhizobium and the legume associate is characterized by all of the following except:
A) multiplies in the vicinity of legume roots
B) bacteria release proteases to digest cell wall
C) change from free-living to swarmer cells
D) swarmers invade root hairs to become bacteroids
Correct Answer:
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Q8: Nitrogen-fixing bacteria:
A)oxidize ammonia to nitrates or nitrites
B)oxidize
Q9: Nitrification is characterized by all of the
Q10: Sulfur oxidation is carried out by _.
A)Thiobacillus
B)Desulfovibrio
C)Desulfomonas
D)Desulfotomaculum
Q11: Sulfate-reducing bacteria are characteristically _.
A)strict anaerobes
B)desulfovibrio
C)utilizing sulfate
Q12: The loss of water from pores of
Q14: Which of the following microbes is not
Q15: Nitrogen-fixing bacteria include:
A)Cyanobacteria
B)Clostridium
C)Klebsiella
D)all of these choices
Q16: Microbes in the environment can be _.
A)producers
B)consumers
C)decomposers
D)all
Q17: Which is a primary symbiotic nitrogen fixer
A)Azotobacter
B)Rhizobium
C)Cyanobacteria
D)Clostridium
Q18: In the sulfur cycle many microbes convert
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