In the sulfur cycle many microbes convert sulfhydryl (-SH) groups to _____,which is toxic to living things.
A) hydrogen sulfate
B) hydrogen sulfide
C) HSH
D) sulfate
Correct Answer:
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Q13: The mechanism whereby Rhizobium and the legume
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
Q19: Most denitrification is due to _.
A)Rhizobium
B)Azotobacter
C)Pseudomonas
D)Nitrosomonas
Q20: Which of the following statements about ecology
Q21: What results from the biological oxygen demand
Q22: Cytophaga,found in soil,is characterized by _.
A)being a
Q23: Molds in soil serve to:
A)aid in decomposition
B)aid
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