Test Bank for Microbiology
The primary goal of biofilms is thought to be - (ANSWER)to stay where food is abundant
Nutrients that a microbe must have but cannot make are known as - (ANSWER)essential nutrients
Which of the following are specific nutrients NOT required by some species of bacteria? -
(ANSWER)growth factors
Which of the following are responsible for the CO2 fixation component of the carbon cycle? -
(ANSWER)autotrophs
A(n) _________ is an organist that lives in an intimate association with a second organism. -
(ANSWER)symbiont
How do some cyanobacteria fix nitrogen while growing aerobically? - (ANSWER)They use special cells
called heterocysts that protect the enzyme.
During biofilm formation, as more and more cells bind to the surface, they begin sending signals to each
other in a process called: - (ANSWER)quorum sensing
You are measuring growth in a bacterial culture. The number of viable cells remains constant, and when
you check the medium, you find that the carbon source has been used up. What phase of growth is the
culture? - (ANSWER)stationary
The following figure represents what type of differentiation? - (ANSWER)sporulation
During which stage of bacterial growth is the culture growing exponentially? - (ANSWER)log
Bacteria divide at a constant time Interval called the - (ANSWER)generation time
, The best method to isolate single colonies is the ________ plate, and the best method to count colonies
is the ________ plate. - (ANSWER)streak; pour
The majority of nitrogen in soil and marine environments is fixed by - (ANSWER)free-living bacteria
Human pathogens are - (ANSWER)mesophilic
Organisms that are adapted to grow at overwhelmingly high pressure are called - (ANSWER)barophiles
Which temperature is lethal to any mesophile? - (ANSWER)autoclave temperature
What piece of equipment is represented by the following schematic diagram? - (ANSWER)autoclave
Which best describes microaerophiles? - (ANSWER)They require a small oxygen concentration to grow.
Filtration of samples to remove bacterial cells typically use micropore filters with pore sizes of -
(ANSWER)0.2 μm
Deinococcus radiodurans resists extreme drought and radiation by which mechanism? -
(ANSWER)repairing DNA damage
Which of the following us NOT true concerning the irradiation of foods? - (ANSWER)Foods become
radioactive when irradiated.
Which of the following can be counted in order to determine the lowest possible number of individual
infectious virions from phage suspension - (ANSWER)plaques
Which infectious agent contains only a nucleic acid genome and lacks a protein coat? - (ANSWER)viroids
Some viral species may derive their _____ from intracellular membranes, such as the nuclear membrane
or endoplasmic reticulum. - (ANSWER)envelope
The primary goal of biofilms is thought to be - (ANSWER)to stay where food is abundant
Nutrients that a microbe must have but cannot make are known as - (ANSWER)essential nutrients
Which of the following are specific nutrients NOT required by some species of bacteria? -
(ANSWER)growth factors
Which of the following are responsible for the CO2 fixation component of the carbon cycle? -
(ANSWER)autotrophs
A(n) _________ is an organist that lives in an intimate association with a second organism. -
(ANSWER)symbiont
How do some cyanobacteria fix nitrogen while growing aerobically? - (ANSWER)They use special cells
called heterocysts that protect the enzyme.
During biofilm formation, as more and more cells bind to the surface, they begin sending signals to each
other in a process called: - (ANSWER)quorum sensing
You are measuring growth in a bacterial culture. The number of viable cells remains constant, and when
you check the medium, you find that the carbon source has been used up. What phase of growth is the
culture? - (ANSWER)stationary
The following figure represents what type of differentiation? - (ANSWER)sporulation
During which stage of bacterial growth is the culture growing exponentially? - (ANSWER)log
Bacteria divide at a constant time Interval called the - (ANSWER)generation time
, The best method to isolate single colonies is the ________ plate, and the best method to count colonies
is the ________ plate. - (ANSWER)streak; pour
The majority of nitrogen in soil and marine environments is fixed by - (ANSWER)free-living bacteria
Human pathogens are - (ANSWER)mesophilic
Organisms that are adapted to grow at overwhelmingly high pressure are called - (ANSWER)barophiles
Which temperature is lethal to any mesophile? - (ANSWER)autoclave temperature
What piece of equipment is represented by the following schematic diagram? - (ANSWER)autoclave
Which best describes microaerophiles? - (ANSWER)They require a small oxygen concentration to grow.
Filtration of samples to remove bacterial cells typically use micropore filters with pore sizes of -
(ANSWER)0.2 μm
Deinococcus radiodurans resists extreme drought and radiation by which mechanism? -
(ANSWER)repairing DNA damage
Which of the following us NOT true concerning the irradiation of foods? - (ANSWER)Foods become
radioactive when irradiated.
Which of the following can be counted in order to determine the lowest possible number of individual
infectious virions from phage suspension - (ANSWER)plaques
Which infectious agent contains only a nucleic acid genome and lacks a protein coat? - (ANSWER)viroids
Some viral species may derive their _____ from intracellular membranes, such as the nuclear membrane
or endoplasmic reticulum. - (ANSWER)envelope
