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Eutrophication
Select one:
a. is characterized by heavy surface algal blooms.
b. restricts the O2 supply to water below the surface.
c. occurs when there are excess nutrients in aquatic ecosystems.
d. causes massive die-off of fish and invertebrates.
e. All of the choices are correct.
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The correct answer is: All of the choices are correctQuestion 3
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You have been using massive amounts of weed killer and insecticide to kill weeds in your yard,
as well as the grubs and aphids that are munching on your roses and your grass. What effect
might this have from a microbiological standpoint?
Select one:
a. Loss of microbial diversity in the soil
b. Reduction in microbial numbers in the soil
c. Damage to the nitrogen fixing bacteria
d. Damage to the mycorrhizae
e. All of the above may be effects of this practice.
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The correct answer is: All of the above may be effects of this practice.
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Nutrient deficient aquatic ecosystems are called .
Select one:
a. eutrophic
b. oligotrophic
c. epitrophic
d. hypotrophic
e. autotrophic
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Question 5
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The correct answer is: oligotrophic
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Which of the following statements regarding biogeochemical cycles is incorrect?
Select one:
a. All organisms directly participate in recycling.
b. All elements originate from a nonliving, long-term reservoir.
c. Cycles are simple systems between living and nonliving components.
d. Elements cycle through biotic and abiotic environments.
e. Recycling keeps nutrients in balance.
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The correct answer is: Cycles are simple systems between living and nonliving components.
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Which of the following statements regarding the infection of root hairs by Rhizobium species is
incorrect?
Select one:
a. Attachment of Rhizobium cells to plant root hair cells induce curling of the root hair.
b. The presence of Rhizobium triggers the formation of syncytial cells.
c. Nodules begin to form in the roots as both plant and bacterial partners differentiate.
d. This is a mutualistic relationship between plant and bacteria.Question 6
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Question 7
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The correct answer is: The presence of Rhizobium triggers the formation of syncytial cells.
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The correct answer is: 57 per 100 ml.
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a. coliforms
b. Clostridia
c. staphylococci
Indicator bacteria for contaminated water are .
Select one:
a. 0.57 per 100 ml.
b. 57 per 100 ml.
c. 5700 per 100 ml.
d. too numerous to count.
A 100 ml sample of water is filtered through a sterile membrane, and the membrane is
transferred to a plate of m-Endo agar. Following overnight incubation at 37°C, 57 green metallic
colonies appear. The coliform count is
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Question 9
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The correct answer is: coliforms
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The correct answer is: Secondary metabolites include amino acids.
Question text
a. Streptokinase
b. Protease
c. Hemolysin
Which enzyme is used in medicine as a blood thinner?
Select one:
a. Primary metabolites are essential to a microbe's function.
b. Secondary metabolites include amino acids.
c. Growth environment is enhanced to increase metabolite synthesis.
d. Select microbial strains are not controlled by feedback mechanisms.
Which of the following is not true of industrial microbiology?
Select one:
d. all bacteriaQuestion 10
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Question 11
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The correct answer is: Streptokinase
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Preservation of food to limit microbial survival and growth includes
Select one:
a. high temperature and pressure.
b. pasteurization.
c. refrigeration and freezing.
d. irradiation.
e. All of the choices are correct.
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The correct answer is: All of the choices are correct.
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a. histones
b. amino acids
The DNA of an organism is made up of subunits called .
Select one:
d. Rennet
e. CellulaseQuestion 12
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Question 13
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The correct answer is: nucleotides
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A permanent, inheritable change in the genetic information is called .
Select one:
a. translation
b. transcription
c. a mutation
d. an alteration
e. regeneration
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The correct answer is: a mutation
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The duplication of a cell's DNA is called .
Select one:
c. nucleotides
d. mRNA
e. polymerasesQuestion 14
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Question 15
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a. mitosis
b. replication
c. transcription
d. translation
e. mutation
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The correct answer is: replication
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The correct answer is: Transformation
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c. Transformation
d. Cloning
a. Transduction
b. Conjugation
In Griffith's experiments with Streptococcus pneumoniae, rough nonencapsulated streptococci
were converted into smooth encapsulated streptococci in the presence of the heat-killed smooth
encapsulated streptococci. Which microbial process had Griffith identified?
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Question 17
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The correct answer is: the DNA strands run antiparallel to each other and the DNA polymerase
can only add nucleotides to the 3' end of the growing strand.
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The various techniques by which scientists manipulate DNA in the lab are termed .
Select one:
a. genetic engineering
b. biotechnology
c. recombinant DNA
d. gel electrophoresis
e. gene probes
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The correct answer is: genetic engineering
a. the DNA strands run antiparallel to each other and the DNA polymerase can only add
b. one RNA primer attaches to the 5' end of the parent strand and the other primer to the 3' end.
c. both RNA primers attach to the 3' end of the template strands, which are at opposite ends from
d. both daughter strands can't extend toward the replication fork because there would not be room
for two DNA polymerase enzymes.
each other.
nucleotides to the 3' end of the growing strand.
The mechanism of DNA synthesis differs between the two new daughter strands during
replication. This is due to the fact that
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Question 19
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DNA fragments can be separated in gel electrophoresis because
Select one:
a. nitrogenous bases have a net positive charge.
b. nitrogenous bases have a net negative charge.
c. phosphate groups have a net positive charge.
d. phosphate groups have a net negative charge.
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The correct answer is: phosphate groups have a net negative charge.
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e. It can be used to detect RNA in cells.
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The correct answer is: It uses electrophoresis to separate the DNA.
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Which of the following is not true of fluorescent in situ hybridization (FISH)?
Select one:
a. Probes can be applied to intact cells.
b. Probes can locate genes on chromosomes.
c. It can be used to identify unknown bacteria without culturing.
d. It uses electrophoresis to separate the DNA.Question 20
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Which of the following recombinant DNA technology products is mismatched?
Select one:
a. Erythropoietin - stimulates erythrocyte production in bone marrow
b. Factor VIII - a protein necessary for the coagulation cascade
c. Interferons - stimulate antiviral protein production
d. Tissue plasminogen activating factor - stimulates blood clotting
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The correct answer is: Tissue plasminogen activating factor - stimulates blood clotting
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Which of the following is the second step in gene mapping?
Select one:
a. Target DNA removed from cells and isolated
b. Cloning host treated with calcium chloride and receives plasmid
c. Separate DNA fragments with gel electrophoresis
d. Desired protein is produced by cloning host
e. Gene is amplified by multiplication of cloning host
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The correct answer is: Separate DNA fragments with gel electrophoresis
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