Bio 2400: Exam 3 Microbiology Review
MCC Questions and Answers.
11. List four different microorganism that can biodegrade petroleum - Answer Pseudomonas
Corynebacterium
Mycobacterium
13. Bacteria that can cause tumor growth on plants - Answer Agrobacterium tumefaciens
12. Name an organism that can metabolically produce petroleum - Answer Bortyoccus
braunii
List three different microorganisms that fix nitrogen - Answer Rhizobium
Anabaena
Frankia
Three different taxonomical methods used in the classifications of bacteria - Answer
Conventional
GC ratio
DNA
Nitrosomonas - Answer the most common bacteria found in soil that oxidizes ammonia to
nitrate.
Nitrobacter - Answer is the most common bacteria found in soil that oxidizes nitrite to nitrate
c. Azotobacter - Answer Live freely and independently in the soil. Nitrogen Fixation.
d. Pseudomonas - Answer Denitrifying Bacteria; the reduction of nitrates (NO3-) to nitrogen
gas (N2).
e. Rhizobium - Answer Living in the root nodule of legume plants (peas or clover). Nitrogen
Fixation. Lives in roots of plants.
a. Treponema - Answer Anaerobic, host-associated spirochetes that are commensals or
parasites of human or animals.
MCC Questions and Answers.
11. List four different microorganism that can biodegrade petroleum - Answer Pseudomonas
Corynebacterium
Mycobacterium
13. Bacteria that can cause tumor growth on plants - Answer Agrobacterium tumefaciens
12. Name an organism that can metabolically produce petroleum - Answer Bortyoccus
braunii
List three different microorganisms that fix nitrogen - Answer Rhizobium
Anabaena
Frankia
Three different taxonomical methods used in the classifications of bacteria - Answer
Conventional
GC ratio
DNA
Nitrosomonas - Answer the most common bacteria found in soil that oxidizes ammonia to
nitrate.
Nitrobacter - Answer is the most common bacteria found in soil that oxidizes nitrite to nitrate
c. Azotobacter - Answer Live freely and independently in the soil. Nitrogen Fixation.
d. Pseudomonas - Answer Denitrifying Bacteria; the reduction of nitrates (NO3-) to nitrogen
gas (N2).
e. Rhizobium - Answer Living in the root nodule of legume plants (peas or clover). Nitrogen
Fixation. Lives in roots of plants.
a. Treponema - Answer Anaerobic, host-associated spirochetes that are commensals or
parasites of human or animals.
