OPENSTAX MICROBIOLOGY TEST BANK
PRACTICE EXAMINATION 2026
QUESTIONS WITH ANSWERS GRADED A+
◍ Some fungi have proven medically useful because they can be used to
produce _________..
Answer: antibiotics
◍ One of the most popular taxonomic tools is DNA fingerprinting to develop
profiles of organisms. These profiles provide direct information about.
Answer: the similarities between nucleotide sequences.
◍ Which of the following is an ascomycete fungus associated with bat
droppings that can cause a respiratory infection if inhaled?.
Answer: Histoplasma capsulatum
◍ Burkholderia was reclassified from the gammaproteobacteria to the
betaproteobacteria because.
Answer: its rRNA sequence is similar to that of Neisseria.
◍ In the microscope, you observe multinucleated amoeboid cells with
sporangia that form spores. This is a(n).
Answer: plasmodial slime mold.
◍ Which of the following refers to photosynthesis performed by bacteria with
the use of water as the donor of electrons?.
Answer: oxygenic
◍ Agar is used as a solidifying agent in microbiological media since few
bacteria can degrade it..
Answer: TRUE
◍ In the malaria parasite life cycle, humans are the _______ host, while
, mosquitoes are the ________ host as well as the vector..
Answer: intermediate; definitive
◍ Which of the following is true of archaea that produce methane?.
Answer: They live in the most extreme environments
◍ Which of the following bacteria is gram-positive?.
Answer: Streptococcus
◍ During which growth phase will gram-positive bacteria be most susceptible
to penicillin?.
Answer: log phase
◍ Application of heat to living cells can result in all of the following
EXCEPT.
Answer: decreased thermal death time.
◍ Which protist is a concern because of its ability to contaminate water
supplies and cause diarrheal illness?.
Answer: Giardia lamblia
◍ A nonsegmented worm is found during a routine colonoscopy of an
individual who reported having abdominal cramps, nausea, and vomiting.
This worm is likely which of the following?.
Answer: nematode
◍ All gram-negative bacteria are classified as proteobacteria..
Answer: FALSE
◍ Once a culture is purified, the next logical step in the process of identifying
bacteria is biochemical testing..
Answer: FALSE
◍ Most cases of hookworm infection are acquired by ingestion of adult forms
in contaminated food or water..
Answer: FALSE
◍ A positive-strand RNA virus:.
Answer: can be used directly to translate viral proteins.
, ◍ Animals belong to the same supergroup as the kingdom __________..
Answer: Fungi
◍ All of the following are characteristic of the Platyhelminthes EXCEPT that
they.
Answer: have highly developed digestive and nervous systems.
◍ Pathogenic bacteria isolated from the respiratory or intestinal tracts of
humans are.
Answer: capnophiles that grow best in carbon dioxide incubators.
◍ Which of the following lacks a cell wall?.
Answer: Mycoplasma
◍ The plasma membrane of a protist is called the __________..
Answer: plasmalemma
◍ Cercariae, metacercaria, redia, and sporocysts are all life cycle stages of
trematodes..
Answer: TRUE
◍ Which of the following statements is a reason for NOT classifying viruses in
one of the three domains of life (Bacteria, Archaea, Eukarya) rather than in a
fourth separate domain?.
Answer: Viruses are not composed of cells.
◍ If two organisms have similar rRNA sequences, you can conclude that they.
Answer: evolved from a common ancestor.
◍ Which enzyme catalyzes the reaction: O2 + O2 + 2H+ H2O2 + O2?.
Answer: superoxide dismutase
◍ Which of the following are found primarily in the intestines of humans?.
Answer: facultatively anaerobic gram-negative rods
◍ Which of the following pairs is mismatched?.
Answer: anamorphs lack spores
◍ Which of the following pairs are mismatched?.
PRACTICE EXAMINATION 2026
QUESTIONS WITH ANSWERS GRADED A+
◍ Some fungi have proven medically useful because they can be used to
produce _________..
Answer: antibiotics
◍ One of the most popular taxonomic tools is DNA fingerprinting to develop
profiles of organisms. These profiles provide direct information about.
Answer: the similarities between nucleotide sequences.
◍ Which of the following is an ascomycete fungus associated with bat
droppings that can cause a respiratory infection if inhaled?.
Answer: Histoplasma capsulatum
◍ Burkholderia was reclassified from the gammaproteobacteria to the
betaproteobacteria because.
Answer: its rRNA sequence is similar to that of Neisseria.
◍ In the microscope, you observe multinucleated amoeboid cells with
sporangia that form spores. This is a(n).
Answer: plasmodial slime mold.
◍ Which of the following refers to photosynthesis performed by bacteria with
the use of water as the donor of electrons?.
Answer: oxygenic
◍ Agar is used as a solidifying agent in microbiological media since few
bacteria can degrade it..
Answer: TRUE
◍ In the malaria parasite life cycle, humans are the _______ host, while
, mosquitoes are the ________ host as well as the vector..
Answer: intermediate; definitive
◍ Which of the following is true of archaea that produce methane?.
Answer: They live in the most extreme environments
◍ Which of the following bacteria is gram-positive?.
Answer: Streptococcus
◍ During which growth phase will gram-positive bacteria be most susceptible
to penicillin?.
Answer: log phase
◍ Application of heat to living cells can result in all of the following
EXCEPT.
Answer: decreased thermal death time.
◍ Which protist is a concern because of its ability to contaminate water
supplies and cause diarrheal illness?.
Answer: Giardia lamblia
◍ A nonsegmented worm is found during a routine colonoscopy of an
individual who reported having abdominal cramps, nausea, and vomiting.
This worm is likely which of the following?.
Answer: nematode
◍ All gram-negative bacteria are classified as proteobacteria..
Answer: FALSE
◍ Once a culture is purified, the next logical step in the process of identifying
bacteria is biochemical testing..
Answer: FALSE
◍ Most cases of hookworm infection are acquired by ingestion of adult forms
in contaminated food or water..
Answer: FALSE
◍ A positive-strand RNA virus:.
Answer: can be used directly to translate viral proteins.
, ◍ Animals belong to the same supergroup as the kingdom __________..
Answer: Fungi
◍ All of the following are characteristic of the Platyhelminthes EXCEPT that
they.
Answer: have highly developed digestive and nervous systems.
◍ Pathogenic bacteria isolated from the respiratory or intestinal tracts of
humans are.
Answer: capnophiles that grow best in carbon dioxide incubators.
◍ Which of the following lacks a cell wall?.
Answer: Mycoplasma
◍ The plasma membrane of a protist is called the __________..
Answer: plasmalemma
◍ Cercariae, metacercaria, redia, and sporocysts are all life cycle stages of
trematodes..
Answer: TRUE
◍ Which of the following statements is a reason for NOT classifying viruses in
one of the three domains of life (Bacteria, Archaea, Eukarya) rather than in a
fourth separate domain?.
Answer: Viruses are not composed of cells.
◍ If two organisms have similar rRNA sequences, you can conclude that they.
Answer: evolved from a common ancestor.
◍ Which enzyme catalyzes the reaction: O2 + O2 + 2H+ H2O2 + O2?.
Answer: superoxide dismutase
◍ Which of the following are found primarily in the intestines of humans?.
Answer: facultatively anaerobic gram-negative rods
◍ Which of the following pairs is mismatched?.
Answer: anamorphs lack spores
◍ Which of the following pairs are mismatched?.
