BIOL 2460- Exam 3 Review Questions and Complete Solutions
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Course
BIO 2460
Institution
BIO 2460
Which of the following methods would be used to measure the concentration of bacterial contamination in processed peanut butter?
A. turbidity measurement B. total plate count C. dry weight measurement D. direct counting of bacteria on a calibrated slide B
In which phase would you expect to observ...
BIOL 2460- Exam 3 Review Questions
and Complete Solutions
Which of the following methods would be used to measure the concentration of bacterial
contamination in processed peanut butter?
A. turbidity measurement
B. total plate count
C. dry weight measurement
D. direct counting of bacteria on a calibrated slide ✅B
In which phase would you expect to observe the most endospores in a Bacillus cell
culture?
A. death phase
B. lag phase
C. log phase
D. log, lag, and death phases would all have roughly the same number of endopores
✅A
During which phase would penicillin, an antibiotic that inhabits cell-wall synthesis, be
most effective?
A. death phase
B. lag phase
C. log phase
D. stationary phase ✅C
Which of the following is the best definition of generation time in a bacterium?
A. the length of time it takes to reach the log phase
B. the length of time it takes for a population of cells to double
C. the time it takes to reach stationary phase
D. the length of time of the exponential phase ✅B
What is the function of the Z ring in binary fission?
A. it controls the replication of DNA
B. it forms the contractile ring at the septum
C. it separates the newly synthesized DNA molecules
D. it mediates the addition of new peptidoglycan subunits ✅B
, If a culture starts with 50 cells, how many cells will be present after five generations with
no cell death?
A. 200
B. 400
C. 1600
D. 3200 ✅C. 1600
Filamentous cyanobacteria often divide by which of the following?
A. budding
B. mitosis
C. fragmentation
D. formation of endospores ✅C
Which is a reason for antimicrobial resistance being higher in a biofilm than in free-
floating bacteria?
A. the EPS allows for faster diffusion of chemicals in the biofilm
B. cells are more metabolically active at the base of the biofilm
C. cells are metabolically inactive at the base of a biofilm
D. the structure of a biofilm favors the survival of antibiotic-resistant cells ✅C
Quorum sensing is used by bacterial cells to determine which if the following?
A. the size of the population
B. the availability of nutrients
C. the speed of water flow
D. the density of the population ✅D
Which of the following statements about autoinducers is incorrect?
A.they bind directly to DNA to activate transcription
B. they can activate the cell that secreted them
C. N-acylated homoserine lactones are autoinducers in gram-negative cells
D. autoinducers may stimulate the production of virulence factors ✅A
An inoculated medium culture tube shows dense growth at the surface and turbidity
throughout the rest of the tube. What is your conclusion?
A. the organisms die in the presence of oxygen
B. the organisms are facultative anaerobes
C. the organisms should be grown in an anaerobic chamber
D. the organisms are obligate aerobes ✅B
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