©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM
Brock Biology of Microorganisms Chapter 5
Exam Questions With Correct Answers
Which of the following is/are transferred to daughter cells during cell division?
a. Genomic DNA, the blueprint for everything the cell needs
b. Individual genes and enzymes to later be brought together to form the genome
c. Chromosome and enzymes to immediately begin cellular metabolism
d. Chromosome, proteins, and all other cellular constituents - answer✔D
2. Which is most abundant and active in divisome complexes?
a. FtsZ
b. DNA replication forks
c. MinCD
d. MreB - answer✔A
3. The process by which two cells arise from one is known as
a. Conjugation
b. Binary fission
c. Meiosis
d. Mitosis - answer✔B
4. A bacterium that lacks the MreB gene will have a ____ shape
a. Bacillus
b. Coccoid
, ©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM
c. Short bacillus
d. Vibrio - answer✔B
5. The time interval required for the formation of two cells from one is called the
a. Generation time
b. Growth time
c. Growth rate
d. Division rate - answer✔A
6. Enumerating cells in a biofilm is especially challenging for
a. Microscopic direct counting
b. Measuring turbidity
c. Viability counts with spread plating
d. Microscopic direct county, measuring turbidity, and viability counts with spread plating -
answer✔D
7. The time between inoculation and the beginning of growth is usually called the
a. Lag phase
b. Log phase
c. Dormant phase
d. Death phase - answer✔A
8. Optical density and viable cell concentration are LEAST proportional to each other during
a. Lag phase
b. Exponential growth phase
c. Stationary phase
d. Death phase - answer✔D
9. To determine viable cell counts of a heat-sensitive bacterial isolate, which cell counting
method would be best to avoid?
a. Spread-plate method
, ©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM
b. Pour-plate method
c. Live staining and direct counting with a microscope
d. Both spread- and pour-plate methods - answer✔B
10. Bacteria that are able to grow in humans and cause disease have likely evolved to be
a. Psychrophiles
b. Mesophiles
c. Theromphiles
d. Hyperthermophiles - answer✔B
11. Where would it be best to isolate bacteria from to study the mechanism of the sodium motive
force?
a. Human gut
b. Hot springs
c. Soda lakes
d. Volcanoes - answer✔C
12. An agar plate for counting colonies and maximizing statistical validity should ideally contain
a. 1 to 100 colonies
b. 50 to 100 colonies
c. 30 to 300 colonies
d. 100 to 1000 colonies - answer✔C
14. The number of colonies obtained in a plate count does not depend on the
a. Inoculum volume
b. Size of the colonies
c. Type of culture medium
d. Incubation time - answer✔B
15. Cell density in a chemostat is controlled by
a. The concentration of the limiting nutrient
10/3/2024 9:54 PM
Brock Biology of Microorganisms Chapter 5
Exam Questions With Correct Answers
Which of the following is/are transferred to daughter cells during cell division?
a. Genomic DNA, the blueprint for everything the cell needs
b. Individual genes and enzymes to later be brought together to form the genome
c. Chromosome and enzymes to immediately begin cellular metabolism
d. Chromosome, proteins, and all other cellular constituents - answer✔D
2. Which is most abundant and active in divisome complexes?
a. FtsZ
b. DNA replication forks
c. MinCD
d. MreB - answer✔A
3. The process by which two cells arise from one is known as
a. Conjugation
b. Binary fission
c. Meiosis
d. Mitosis - answer✔B
4. A bacterium that lacks the MreB gene will have a ____ shape
a. Bacillus
b. Coccoid
, ©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM
c. Short bacillus
d. Vibrio - answer✔B
5. The time interval required for the formation of two cells from one is called the
a. Generation time
b. Growth time
c. Growth rate
d. Division rate - answer✔A
6. Enumerating cells in a biofilm is especially challenging for
a. Microscopic direct counting
b. Measuring turbidity
c. Viability counts with spread plating
d. Microscopic direct county, measuring turbidity, and viability counts with spread plating -
answer✔D
7. The time between inoculation and the beginning of growth is usually called the
a. Lag phase
b. Log phase
c. Dormant phase
d. Death phase - answer✔A
8. Optical density and viable cell concentration are LEAST proportional to each other during
a. Lag phase
b. Exponential growth phase
c. Stationary phase
d. Death phase - answer✔D
9. To determine viable cell counts of a heat-sensitive bacterial isolate, which cell counting
method would be best to avoid?
a. Spread-plate method
, ©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM
b. Pour-plate method
c. Live staining and direct counting with a microscope
d. Both spread- and pour-plate methods - answer✔B
10. Bacteria that are able to grow in humans and cause disease have likely evolved to be
a. Psychrophiles
b. Mesophiles
c. Theromphiles
d. Hyperthermophiles - answer✔B
11. Where would it be best to isolate bacteria from to study the mechanism of the sodium motive
force?
a. Human gut
b. Hot springs
c. Soda lakes
d. Volcanoes - answer✔C
12. An agar plate for counting colonies and maximizing statistical validity should ideally contain
a. 1 to 100 colonies
b. 50 to 100 colonies
c. 30 to 300 colonies
d. 100 to 1000 colonies - answer✔C
14. The number of colonies obtained in a plate count does not depend on the
a. Inoculum volume
b. Size of the colonies
c. Type of culture medium
d. Incubation time - answer✔B
15. Cell density in a chemostat is controlled by
a. The concentration of the limiting nutrient
