MCB3023 EXAM 2 MODULES 2.1-2.3
100% CORRECT
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
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
Which of the following questions must be considered when selecting an antimicrobial
drug?
all of the above
Can it reach the site of infection?
Is the pathogen susceptible to the drug?
Is the pathogen resistant to the drug? - ANSWER-all of the above
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
___________ ____________ is a process that can completely catabolize an organic
energy source to CO2 using the glycolytic pathways and TCA cycle with O2 as the
terminal electron acceptor for an electron transport chai - ANSWER-Aerobic
respiration
Enzyme activity can be controlled by
allosteric regulation.
covalent modification.
feedback (end product inhibition)
all of the above - ANSWER-all of the above
100% CORRECT
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
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
Which of the following questions must be considered when selecting an antimicrobial
drug?
all of the above
Can it reach the site of infection?
Is the pathogen susceptible to the drug?
Is the pathogen resistant to the drug? - ANSWER-all of the above
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
___________ ____________ is a process that can completely catabolize an organic
energy source to CO2 using the glycolytic pathways and TCA cycle with O2 as the
terminal electron acceptor for an electron transport chai - ANSWER-Aerobic
respiration
Enzyme activity can be controlled by
allosteric regulation.
covalent modification.
feedback (end product inhibition)
all of the above - ANSWER-all of the above
