Bio 204 Quiz and Test Answers Exam 2
Which of the following was used in the past to prevent the transmission of
gonorrhea from an infected mother to her newborn? - silver nitrate
In microbiology, the term "growth" could easily refer to which of the following? -
An increase in the number of microbial cells
A colony-forming unit is the number of cells - that produce only one colony
Small organic molecules called vitamins function as coenzymes or as components
of coenzymes. - True
The length of the lag phase of growth can vary depending on - all of the above
(-the condition of the microorganisms
-the incubation temperature
-the pH of the medium
-the composition of the growth medium)
Organisms that do not require oxygen for growth but grow better in its presence are
called - faculative anaerobes
Vitamin K is needed in order to - help in the process of blood clotting after injury.
Unlike autotrophs that synthesize their own organic molecules from __ and
carbonates, organotrophs obtain their carbon from __ of other organisms. -
macromolecules
,Nitrogen can be obtained from inorganic sources only - False
Tap water is used sometimes to prepare growth media in the laboratory because - it
provides microbes with the necessary trace elements.
Vitamin K is a necessary macronutrient. - False
During which growth phase are bacteria more susceptible to antimicrobial drugs? -
log phase
Obligate anaerobes are usually poisoned by molecular oxygen but may grow in
aerobic habitats if associated with facultative anaerobes that use up all available
oxygen. - True
Essential amino acids are those that cannot be synthesized by an organism and so
must be provided as a nutrient. - True
During the bacterial growth curve the lag phase - Is considered to be the time
necessary for adjustment to a new environment
Large numbers of small monomeric molecules join together to form large
molecules that are known as - macromolecules
In the death phase of the microbial growth curve, all cells have not died. - True
Which of the following best describe the energy source of a chemoorganotroph? -
glucose
, Which of the following is a reason for the occurrence of a lag phase in a bacterial
growth curve? - all of the above
(-The cells may be old and depleted of ATP, essential cofactors, and ribosomes that
must be synthesized before growth can begin
-The medium may be different from the previous growth medium so that the cells
must synthesize new enzymes to use different nutrients.
-The organisms may have been injured and require time to recover.
-the inoculum may have been all spores)
Fastidious microbes cannot be pathogenic in humans. - False
Sulfur can be obtained from organic source. - False
Human pathogens are classified as - mesophiles
Agar is a useful compound in the microbiology lab because it is an excellent
nutrient for bacteria. - False
For the bacterial growth curve, the generation time is defined as - the time it takes
to divide
Nutritionally, you are classified as which of the following? - chemoheterotroph
The total number of viable microorganisms remains constant in stationary phase
because - there is a balance between cell division and cell death.
Which of the following was used in the past to prevent the transmission of
gonorrhea from an infected mother to her newborn? - silver nitrate
In microbiology, the term "growth" could easily refer to which of the following? -
An increase in the number of microbial cells
A colony-forming unit is the number of cells - that produce only one colony
Small organic molecules called vitamins function as coenzymes or as components
of coenzymes. - True
The length of the lag phase of growth can vary depending on - all of the above
(-the condition of the microorganisms
-the incubation temperature
-the pH of the medium
-the composition of the growth medium)
Organisms that do not require oxygen for growth but grow better in its presence are
called - faculative anaerobes
Vitamin K is needed in order to - help in the process of blood clotting after injury.
Unlike autotrophs that synthesize their own organic molecules from __ and
carbonates, organotrophs obtain their carbon from __ of other organisms. -
macromolecules
,Nitrogen can be obtained from inorganic sources only - False
Tap water is used sometimes to prepare growth media in the laboratory because - it
provides microbes with the necessary trace elements.
Vitamin K is a necessary macronutrient. - False
During which growth phase are bacteria more susceptible to antimicrobial drugs? -
log phase
Obligate anaerobes are usually poisoned by molecular oxygen but may grow in
aerobic habitats if associated with facultative anaerobes that use up all available
oxygen. - True
Essential amino acids are those that cannot be synthesized by an organism and so
must be provided as a nutrient. - True
During the bacterial growth curve the lag phase - Is considered to be the time
necessary for adjustment to a new environment
Large numbers of small monomeric molecules join together to form large
molecules that are known as - macromolecules
In the death phase of the microbial growth curve, all cells have not died. - True
Which of the following best describe the energy source of a chemoorganotroph? -
glucose
, Which of the following is a reason for the occurrence of a lag phase in a bacterial
growth curve? - all of the above
(-The cells may be old and depleted of ATP, essential cofactors, and ribosomes that
must be synthesized before growth can begin
-The medium may be different from the previous growth medium so that the cells
must synthesize new enzymes to use different nutrients.
-The organisms may have been injured and require time to recover.
-the inoculum may have been all spores)
Fastidious microbes cannot be pathogenic in humans. - False
Sulfur can be obtained from organic source. - False
Human pathogens are classified as - mesophiles
Agar is a useful compound in the microbiology lab because it is an excellent
nutrient for bacteria. - False
For the bacterial growth curve, the generation time is defined as - the time it takes
to divide
Nutritionally, you are classified as which of the following? - chemoheterotroph
The total number of viable microorganisms remains constant in stationary phase
because - there is a balance between cell division and cell death.
