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Bio 204 Quiz and Test Answers Exam 2
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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 i...

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  • September 2, 2024
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  • 2024/2025
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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.

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