Question

Review Test - Ch. 9 13. Given a log phase bacterial culture with 1 x 10$^6$ cells per ml and a generation time of 30 minutes, how long does it take the culture to reach a density of 6.4 x 10$^7$ cells per ml? A. 1 hour B. 2 hours C. 3 hours D. 4 hours E. 6 hours 14. Which of the following is NOT a possible reason for entry into the stationary phase of growth? A. Nutrient limitation B. Limited oxygen availability C. Toxic waste accumulation D. Critical population density reached E. All of the above are possible reasons 15. found in the death phase are associated with certain chronic infections and do not respond to antibiotic treatment. A. Bacteria B. Daughter cells C. Pathogens D. Persisters E. Vegetative cells 16. means bacteria cannot grow under lab conditions but may grow under appropriate conditions. A. Death phase B. Genetically programmed cell death C. Starvation response D. Viable but nonculturable E. None of the above 17. A culture in a closed vessel to which no additional medium is added and from which no waste products are removed is called a(n) __ culture. A. Batch B. Continuous C. Enrichment D. Fed-batch E. Semi-continuous 18. Which of the following is NOT true of chemostats? A. An open system B. An essential nutrient is in limiting quantities C. Has a photocell that measures the turbidity D. Maintains cells in log phase E. All of the above are true 3

          Review Test - Ch. 9
13. Given a log phase bacterial culture with 1 x 10$^6$ cells per ml and a generation time of 30
minutes, how long does it take the culture to reach a density of 6.4 x 10$^7$ cells per ml?
A. 1 hour
B. 2 hours
C. 3 hours
D. 4 hours
E. 6 hours
14. Which of the following is NOT a possible reason for entry into the stationary phase of growth?
A. Nutrient limitation
B. Limited oxygen availability
C. Toxic waste accumulation
D. Critical population density reached
E. All of the above are possible reasons
15. ______ found in the death phase are associated with certain chronic infections
and do not respond to antibiotic treatment.
A. Bacteria
B. Daughter cells
C. Pathogens
D. Persisters
E. Vegetative cells
16. ______ means bacteria cannot grow under lab conditions but may grow
under appropriate conditions.
A. Death phase
B. Genetically programmed cell death
C. Starvation response
D. Viable but nonculturable
E. None of the above
17. A culture in a closed vessel to which no additional medium is added and from which no
waste products are removed is called a(n) ______ culture.
A. Batch
B. Continuous
C. Enrichment
D. Fed-batch
E. Semi-continuous
18. Which of the following is NOT true of chemostats?
A. An open system
B. An essential nutrient is in limiting quantities
C. Has a photocell that measures the turbidity
D. Maintains cells in log phase
E. All of the above are true
3

Review Test - Ch. 9
13. Given a log phase bacterial culture with 1 x 10^6 cells per ml and a generation time of 30
minutes, how long does it take the culture to reach a density of 6.4 x 10^7 cells per ml?
A. 1 hour
B. 2 hours
C. 3 hours
D. 4 hours
E. 6 hours
14. Which of the following is NOT a possible reason for entry into the stationary phase of growth?
A. Nutrient limitation
B. Limited oxygen availability
C. Toxic waste accumulation
D. Critical population density reached
E. All of the above are possible reasons
15. found in the death phase are associated with certain chronic infections
and do not respond to antibiotic treatment.
A. Bacteria
B. Daughter cells
C. Pathogens
D. Persisters
E. Vegetative cells
16. means bacteria cannot grow under lab conditions but may grow
under appropriate conditions.
A. Death phase
B. Genetically programmed cell death
C. Starvation response
D. Viable but nonculturable
E. None of the above
17. A culture in a closed vessel to which no additional medium is added and from which no
waste products are removed is called a(n) culture.
A. Batch
B. Continuous
C. Enrichment
D. Fed-batch
E. Semi-continuous
18. Which of the following is NOT true of chemostats?
A. An open system
B. An essential nutrient is in limiting quantities
C. Has a photocell that measures the turbidity
D. Maintains cells in log phase
E. All of the above are true
3

Added by Thomas A.

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