Straighterline Microbiology Midterm Exam
Review With 100% Correct And Verified
Answers 2025-2026, Guaranteed Pass
Agar is a complex polysaccharide that comes from a/an ___________.
a. green plant
b. fungus
c. bacterium
d. algae
e. marine invertebrate - Correct Answer-d. algae
Using microbes to detoxify a site contaminated with heavy metals is
an example of _________.
a. biotechnology
b. bioremediation
c. decomposition
d. immunology
e. epidemiology - Correct Answer-b. bioremediation
The three physical forms of laboratory media are _____________.
a. solid, liquid, and gas
b. solid, semisolid, and liquid
c. a streak plate, a pour plate, and a broth
d. reducing, transport, and enumeration - Correct Answer-b. solid,
semisolid, and liquid
Which of the following is a traditional human use of microorganisms?
a. baking
b. treating water and sewage
c. mass-producing antibiotics
,d. cleaning up oil spills - Correct Answer-a. baking bread
Which of the following represents a synthesis reaction?
a. AB --> A + B
b. A + B --> AB
c. AB + XY --> AY +XB
d. AB + XY <--> AY + XB - Correct Answer-b. A + B --> AB
Basic dyes are
a. attracted to the acidic surface of bacterial cells
b. anionic
c. used in negative staining
d. repelled by cells
e. dyes such as India ink and nigrosin - Correct Answer-a. attracted to
the acidic surface of bacterial cells
The type of microscopy in which you would observe brightly
illuminated specimens against a black background is __________
a. confocal
b. dark-field
c. phase-contrast
d. fluorescence
e. electron - Correct Answer-b. dark-field
A reducing medium is used to culture _________ organisms.
a. fastidious
b. aerobic
c. anaerobic
d. pathogenic - Correct Answer-c. anaerobic
In the cell cytoplasm, molecules of ATP are a ________
a. solute
b. solvent - Correct Answer-a. solute
, A diagram of the three domains (Bacteria, Archaea, Eukarya)
proceeding from the Last Universal Common Ancestor would show
Archaea
a. as the original cells from which the others derived
b. branching off the domain Eukarya
c. branching off of the domain Bacteria - Correct Answer-b. branching
off the domain Eukarya
In the experiments constructed by Pasteur to disprove spontaneous
generation, swan-necked flasks were used. Why was this shape of
flask used in this experiment.
a. the glass neck needed to be open to the air, yet constructed so that
bacteria would settle in the lowest part of the flask
b. these flask shapes were the easiest and cheapest to produce
c. the shape of the glass neck allowed the bacteria into the flask and
then into the media, but air could not enter
d. Because the glass necks were stretched out, the heat used to
sterilize the medium inside of the flask could not kill the bacteria in
the neck - Correct Answer-a. the glass neck needed to be open to the
air, yet constructed so that bacteria would settle in the lowest part of
the flask
Atoms that gain or lose electrons become charged particles
called____________
a. cations
b. anions
c. ions
d. isotopes - Correct Answer-c. ions
The three cell types discussed, eukaryotes, archaea, and bacteria, all
derived from
a. the last universal common ancestor
b. photosynthetic bacteria
Review With 100% Correct And Verified
Answers 2025-2026, Guaranteed Pass
Agar is a complex polysaccharide that comes from a/an ___________.
a. green plant
b. fungus
c. bacterium
d. algae
e. marine invertebrate - Correct Answer-d. algae
Using microbes to detoxify a site contaminated with heavy metals is
an example of _________.
a. biotechnology
b. bioremediation
c. decomposition
d. immunology
e. epidemiology - Correct Answer-b. bioremediation
The three physical forms of laboratory media are _____________.
a. solid, liquid, and gas
b. solid, semisolid, and liquid
c. a streak plate, a pour plate, and a broth
d. reducing, transport, and enumeration - Correct Answer-b. solid,
semisolid, and liquid
Which of the following is a traditional human use of microorganisms?
a. baking
b. treating water and sewage
c. mass-producing antibiotics
,d. cleaning up oil spills - Correct Answer-a. baking bread
Which of the following represents a synthesis reaction?
a. AB --> A + B
b. A + B --> AB
c. AB + XY --> AY +XB
d. AB + XY <--> AY + XB - Correct Answer-b. A + B --> AB
Basic dyes are
a. attracted to the acidic surface of bacterial cells
b. anionic
c. used in negative staining
d. repelled by cells
e. dyes such as India ink and nigrosin - Correct Answer-a. attracted to
the acidic surface of bacterial cells
The type of microscopy in which you would observe brightly
illuminated specimens against a black background is __________
a. confocal
b. dark-field
c. phase-contrast
d. fluorescence
e. electron - Correct Answer-b. dark-field
A reducing medium is used to culture _________ organisms.
a. fastidious
b. aerobic
c. anaerobic
d. pathogenic - Correct Answer-c. anaerobic
In the cell cytoplasm, molecules of ATP are a ________
a. solute
b. solvent - Correct Answer-a. solute
, A diagram of the three domains (Bacteria, Archaea, Eukarya)
proceeding from the Last Universal Common Ancestor would show
Archaea
a. as the original cells from which the others derived
b. branching off the domain Eukarya
c. branching off of the domain Bacteria - Correct Answer-b. branching
off the domain Eukarya
In the experiments constructed by Pasteur to disprove spontaneous
generation, swan-necked flasks were used. Why was this shape of
flask used in this experiment.
a. the glass neck needed to be open to the air, yet constructed so that
bacteria would settle in the lowest part of the flask
b. these flask shapes were the easiest and cheapest to produce
c. the shape of the glass neck allowed the bacteria into the flask and
then into the media, but air could not enter
d. Because the glass necks were stretched out, the heat used to
sterilize the medium inside of the flask could not kill the bacteria in
the neck - Correct Answer-a. the glass neck needed to be open to the
air, yet constructed so that bacteria would settle in the lowest part of
the flask
Atoms that gain or lose electrons become charged particles
called____________
a. cations
b. anions
c. ions
d. isotopes - Correct Answer-c. ions
The three cell types discussed, eukaryotes, archaea, and bacteria, all
derived from
a. the last universal common ancestor
b. photosynthetic bacteria
