Bio 1108 exam 2 | UPDATED Questions with 100% Verified
Answers
Q1: Some researchers have begun attempting to clean up oil spills by adding bacteria known as Alanovorax
to the spill, in the hope that these bacteria will neutralize the dangerous chemicals in the spill. This is an
example of
A: bioremediation
Q2: During aerobic (cellular) respiration, some bacteria use sugar as a source of electrons and ____ as an
electron acceptor to generate energy in the form of ATP
A: oxygen
Q3: Prokaryotes are classified as belonging to two different domains. What are the domains?
A: Bacteria and Archaea
Q4: A water sample from a hot thermal vent contained a single celled organism that had a cell wall but
lacked a nucleus. What is its most likely classification?
A: Archaea
Q5: A prokaryote that obtains energy (ATP) and carbon as it decomposes dead organisms would be
considered a(n
A: heterotroph and chemotroph
Q6: Chemicals, secreted by soil fungi and actinobacteria produce compounds, known as __________, which
act as a defense against other microorganisms.
A: antibiotics
Q7: Which of the following events in the evolution of cyanobacteria made aerobic respiration possible for
complex life to evolve for the first time on Earth?
A: the production of oxygen through photosynthesis
Q8: In which of the following ways do bacteria differ from archaeans?
A: structural material of their cell walls.
, Q9: Carl Woese and collaborators identified two major branches of prokaryotic evolution. What was the basis
for dividing prokaryotes into two domains?
A: genetic characteristics such as ribosomal RNA sequences
Q10: A phototrophic bacterium would be an organism that produces chemical energy using
A: sunlight
Q11: To establish a link between a specific bacterium and a skin disease, researchers have shown that the
bacterium was present in sick persons but not in healthy individuals. They isolated the bacterium in a pure
culture and demonstrated that experimental healthy animals injected with this culture became sick. What
other experiment do researchers need to perform to be absolutely sure that the bacterium is responsible for
the disease?
A: isolate bacterium from an infected sick animal and demonstrate that it is the same
bacterium as the one used for infection
Q12: Many modern archaeans are considered extremophiles. Which of the following statements about these
organisms would be considered TRUE?
A: they inhabit environments which would have been common on primitive Earth
Q13: Which of the following best describes how nitrogenfixing bacteria make nitrogen available to
organisms, such as plants?
A: they convert the nitrogen gas in the atmosphere to ammonia and nitrates.
Q14: Microbiologists use the Gram stain to aid in the identification of bacteria. What is the major difference
between Gram positive and Gramnegative bacteria?
A: the thickness of peptidoglycan in the cell wall
Q15: Protists from which of the following taxonomic groups are most likely to lead to paralytic shellfish
poisoning known as red tide?
A: dinoflagellates
Q16: Which of the following lines of evidence supports the endosymbiotic theory that mitochondria were at
one time a proteobacteria engulfed by a eukaryotic ancestor?
A: mitochondrial genes are similar to those of bacterial genes.
Answers
Q1: Some researchers have begun attempting to clean up oil spills by adding bacteria known as Alanovorax
to the spill, in the hope that these bacteria will neutralize the dangerous chemicals in the spill. This is an
example of
A: bioremediation
Q2: During aerobic (cellular) respiration, some bacteria use sugar as a source of electrons and ____ as an
electron acceptor to generate energy in the form of ATP
A: oxygen
Q3: Prokaryotes are classified as belonging to two different domains. What are the domains?
A: Bacteria and Archaea
Q4: A water sample from a hot thermal vent contained a single celled organism that had a cell wall but
lacked a nucleus. What is its most likely classification?
A: Archaea
Q5: A prokaryote that obtains energy (ATP) and carbon as it decomposes dead organisms would be
considered a(n
A: heterotroph and chemotroph
Q6: Chemicals, secreted by soil fungi and actinobacteria produce compounds, known as __________, which
act as a defense against other microorganisms.
A: antibiotics
Q7: Which of the following events in the evolution of cyanobacteria made aerobic respiration possible for
complex life to evolve for the first time on Earth?
A: the production of oxygen through photosynthesis
Q8: In which of the following ways do bacteria differ from archaeans?
A: structural material of their cell walls.
, Q9: Carl Woese and collaborators identified two major branches of prokaryotic evolution. What was the basis
for dividing prokaryotes into two domains?
A: genetic characteristics such as ribosomal RNA sequences
Q10: A phototrophic bacterium would be an organism that produces chemical energy using
A: sunlight
Q11: To establish a link between a specific bacterium and a skin disease, researchers have shown that the
bacterium was present in sick persons but not in healthy individuals. They isolated the bacterium in a pure
culture and demonstrated that experimental healthy animals injected with this culture became sick. What
other experiment do researchers need to perform to be absolutely sure that the bacterium is responsible for
the disease?
A: isolate bacterium from an infected sick animal and demonstrate that it is the same
bacterium as the one used for infection
Q12: Many modern archaeans are considered extremophiles. Which of the following statements about these
organisms would be considered TRUE?
A: they inhabit environments which would have been common on primitive Earth
Q13: Which of the following best describes how nitrogenfixing bacteria make nitrogen available to
organisms, such as plants?
A: they convert the nitrogen gas in the atmosphere to ammonia and nitrates.
Q14: Microbiologists use the Gram stain to aid in the identification of bacteria. What is the major difference
between Gram positive and Gramnegative bacteria?
A: the thickness of peptidoglycan in the cell wall
Q15: Protists from which of the following taxonomic groups are most likely to lead to paralytic shellfish
poisoning known as red tide?
A: dinoflagellates
Q16: Which of the following lines of evidence supports the endosymbiotic theory that mitochondria were at
one time a proteobacteria engulfed by a eukaryotic ancestor?
A: mitochondrial genes are similar to those of bacterial genes.
