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Microbiology Exam 2
Terms in this set (55)
Which of the following statements about archaea is FALSE?
They evolved before bacteria.
If two organisms have similar rRNA sequences, you can conclude that they
evolved from a common ancestor.
Which of the following is the best evidence for a three-domain system?
There are three distinctly different sets of metabolic reactions.
Bacteria and Archaea are similar in which of the following?
considered prokaryotic cells
Into which group would you place a photosynthetic cell that lacks a nucleus?
You discovered a unicellular organism that lacks a nucleus and peptidoglycan. You suspect the organism is in the group
Which type of organism would NOT be included in the Domain Eukarya?
What is the outstanding characteristic of the Kingdom Fungi?
Members absorb dissolved organic matter
Which of the following statements about members of the Kingdom Plantae is FALSE?
They use organic carbon sources.
Which of the following statements about the members of the Kingdom Animalia is FALSE?
They undergo photosynthesis.
A genus can best be defined as _________.
a taxon comprised of one or more species and below family
A clone is
genetically identical cells derived from a single cell.
Into which group would you place a multicellular heterotroph with chitin cell walls?
You have isolated and grown a pure culture of a prokaryotic cell type. The first step in identification is a(n)
Which gammaproteobacteria are facultatively anaerobic, Gram-negative rods that inhabit the intestinal tracts of humans and other animals?
Which of the following photosynthetic bacteria carries out oxygenic photosynthesis and most likely altered Earth's atmosphere by significantly contributing to the accumulation of oxygen gas?
Cyanobacteria, such as Anabaena and Prochlorococcus
Which of the following best describes the enterics, a bacterial group found primarily in the intestines of humans?
facultatively anaerobic gram-negative rods
Which of the following is NOT an enteric?
You have isolated a bacterium that grows in a medium containing only inorganic nutrients. Ammonia is oxidized to a nitrate ion. This bacterium is
Escherichia coli belongs to the
Gram-positive organisms with high G+C content are in the phylum __________.
All gram-negative bacteria are classified as proteobacteria.
Photosynthetic organisms always produce oxygen gas as a metabolic byproduct.
The characteristic most notable regarding the mycoplasmas is that they
lack cell walls.
Staphylococcus and Streptococcus can usually be differentiated by microscope examination because of
Which of the following bacteria is gram-positive?
Which of the following bacteria are responsible for more infections and more different kinds of infections?
The majority of bacterial species on Earth have not been successfully cultivated.
Which of the following statements regarding lichens is FALSE?
Lichens are a mutualistic relationship between a fungus and a protozoan.
Which of the following pairs is mismatched?
Green algae - prokaryotic
Which of the following statements about algae is FALSE
All are unicellular.
All of the following are characteristic of algae EXCEPT which ONE of the following?
They are currently classified as plants
Some species of dinoflagellates produce neurotoxins that cause fish kills and red tides.
Which of the following statements regarding protozoa is FALSE?
Nearly all protozoa cause disease.
Which of the following is the most effective control for malaria?
eliminate Anopheles mosquitoes
Which of the following tends to be more complex in a parasitic helminth than in free-living helminths?
Helminthic diseases are usually transmitted to humans by
In the malaria parasite life cycle, humans are the ________ host, while mosquitoes are the ________ host as well as the vector.
Arthropod vectors are blood-sucking animals such as ticks, lice, and fleas that transmit microbial pathogens.
An agent used to reduce the number of bacteria on a toilet would most accurately be called a(n)
Which of the following best describes the pattern of microbial death?
The cells in a population die at a constant rate.
Application of heat to living cells can result in all of the following EXCEPT
decreased thermal death time.
When microbial control methods are used, microbes are destroyed at a constant rate; there is no instantaneous death of all the microbes present. That microbial death rate is influenced by all of the following factors EXCEPT __________.
toxins produced by the microbe
The thermal death time is the time needed to kill all the bacteria in a particular culture at a certain temperature.
Microbial control methods usually target any of the following cellular components EXCEPT which one?
Which of the following physical methods of microbial control denatures proteins as a mechanism of action?
boiling or autoclaving
Which of the following is the best method to sterilize heat-labile solutions?
Which of the following does NOT achieve sterilization?
Which of the following is a limitation of the autoclave?
It cannot be used with heat-labile materials.
Which of the following methods is used to preserve food by slowing the metabolic processes of foodborne microbes?
The preservation of beef jerky from microbial growth relies on which method of microbial control?
Moist heat destroys organisms by denaturing proteins.
Autoclaving is the most effective method of moist heat sterilization.
Which of the following disinfectants acts by disrupting the plasma membrane?
Which of the following results in lethal damage to nucleic acids?
heat, radiation, and some chemicals
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