Mcb3023: Final Exam 2 modules 2.1-
2.3 Test Questions All Solved Correct
2026 Updated.
Messenger RNA (mRNA) can best be described as a molecule that contains the code for a -
Answer polypeptide
Replication of the bacterial chromosome begins at how many locations? - Answer one
The mRNA of bacterial cells is often polycistronic. What does this term mean? - Answer It
contains the code for multiple peptides
What is the "sexual transfer" of genes in bacteria called? - Answer conjugation
Which term applies to the transfer of genes from mother to daughter cell? - Answer vertical
gene transfer
Term for the transfer of donor DNA to a recipient bacterium via a bacteriophage - Answer
transduction
Bacterial mutants have been very useful for studying and understanding:
- biosynthetic pathways
- capsule production
- antibiotic resistance
- carbon metabolism
- all of the above - Answer all of these choices
The actin-like protein that seems to be involved in determining cell shape is - Answer MreB
A growth medium that favors the growth of some microorganisms but inhibits the growth of
other microorganisms is a __________ medium. - Answer selective
Which of the following can be used to isolate pure cultures of bacteria from mixtures? - Answer
all of the choices
, streak plates, pour plates, spread plates
The most selective antibiotics are those that - Answer inhibit cell wall synthesis
Which of the following microbial control methods result in the most rapid decrease in microbial
numbers? - Answer sterilization
Organisms that grow near deep-sea volcanic vents are likely to be - Answer barophilic
______ are strains that are unable to grow on a minimal medium that supports growth of the
wild type strain but are able to grow on the minimal medium if one or more nutritional
supplements are added - Answer Auxotrophs
A process that kills, inhibits, or removes pathogenic microorganisms is called - Answer
disinfection
Microorganisms are most nearly uniform in terms of chemical and physiological properties
during __________ phase. - Answer exponential
Organisms that do not require oxygen for growth but grow better in its presence are called -
Answer facultative anaerobes
Which of the following can be used to estimate the number of microorganisms in a culture?
a. Direct counts of microbial cells
b. Counts of viable cells using colony growth procedures
c. Measurements of microbial biomass.
d. All of the above - Answer all of the choices
Which of the following environmental factors makes microbial populations resistant to
antimicrobial agents?
a. Ability to form a biofilm
b. Acidic conditions
c. Presence of organic matter
d. All of the above - Answer all of the above
2.3 Test Questions All Solved Correct
2026 Updated.
Messenger RNA (mRNA) can best be described as a molecule that contains the code for a -
Answer polypeptide
Replication of the bacterial chromosome begins at how many locations? - Answer one
The mRNA of bacterial cells is often polycistronic. What does this term mean? - Answer It
contains the code for multiple peptides
What is the "sexual transfer" of genes in bacteria called? - Answer conjugation
Which term applies to the transfer of genes from mother to daughter cell? - Answer vertical
gene transfer
Term for the transfer of donor DNA to a recipient bacterium via a bacteriophage - Answer
transduction
Bacterial mutants have been very useful for studying and understanding:
- biosynthetic pathways
- capsule production
- antibiotic resistance
- carbon metabolism
- all of the above - Answer all of these choices
The actin-like protein that seems to be involved in determining cell shape is - Answer MreB
A growth medium that favors the growth of some microorganisms but inhibits the growth of
other microorganisms is a __________ medium. - Answer selective
Which of the following can be used to isolate pure cultures of bacteria from mixtures? - Answer
all of the choices
, streak plates, pour plates, spread plates
The most selective antibiotics are those that - Answer inhibit cell wall synthesis
Which of the following microbial control methods result in the most rapid decrease in microbial
numbers? - Answer sterilization
Organisms that grow near deep-sea volcanic vents are likely to be - Answer barophilic
______ are strains that are unable to grow on a minimal medium that supports growth of the
wild type strain but are able to grow on the minimal medium if one or more nutritional
supplements are added - Answer Auxotrophs
A process that kills, inhibits, or removes pathogenic microorganisms is called - Answer
disinfection
Microorganisms are most nearly uniform in terms of chemical and physiological properties
during __________ phase. - Answer exponential
Organisms that do not require oxygen for growth but grow better in its presence are called -
Answer facultative anaerobes
Which of the following can be used to estimate the number of microorganisms in a culture?
a. Direct counts of microbial cells
b. Counts of viable cells using colony growth procedures
c. Measurements of microbial biomass.
d. All of the above - Answer all of the choices
Which of the following environmental factors makes microbial populations resistant to
antimicrobial agents?
a. Ability to form a biofilm
b. Acidic conditions
c. Presence of organic matter
d. All of the above - Answer all of the above
