Which of the following statements considering the human body as an
ecosystem is incorrect?
Select one:
a. The skin, the gut, and the nasopharynx are
... [Show More] all habitats.
b. The microbes present in dental plaque constitute a community.
c. Lactobacillus acidophilus and Lactobacillus jensenii are populations
within the vaginal community.
d. An infection can be considered a habitat's response to an alteration in
environmental conditions.
Question 2
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Considering the human body as an ecosystem, which of the following
statements is incorrect?
Select one:
a. Microbes act as producers, consumers, and decomposers within the
human ecosystem.
b. Energy for the human microbiome derives exclusively from the food
we eat.
c. The microbiota in the human gut is comprised of heterotrophs.
d. The human ecosystem lacks an autotrophic niche.
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The major group of organisms that fix nitrogen into ammonia and then
oxidize it to nitrate are ______.
Select one:
a. protozoa
b. bacteria
c. algae
d. fungi
Question 4
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The full extent of the diversity and abundance of life on earth has only
been understood in the past few years as a result of
Select one:
a. techniques to identify organisms that do not rely on culturing.
b. advances in deep oceanography and deep earth mining engineering.c. environmental movements to preserve parks, coral reefs, and glaciers.
d. microscopy techniques to identify the vast quantity of viruses present
in all environments.
Question 5
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The breakdown of man-made compounds by decomposers is called
______.
Select one:
a. mineralization
b. bioremediation
c. decomposition
d. parasitism
e. saprobism
Question 6
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Primary sewage treatment includes ______.Select one:
a. sludge digesting
b. skimming
c. filtration
d. chlorination
e. aeration
Question 7
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Indicator bacteria for contaminated water are ______.
Select one:
a. coliforms
b. Clostridia
c. staphylococci
d. all bacteria
Question 8
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Nitrates and nitrites are used in cured meats to prevent ______.
Select one:
a. botulism intoxication
b. S. aureus food poisoning
c. mold growth
d. infection from fruits and nuts
Question 9
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What is the best definition of biotransformation?
Select one:
a. Production of alcohol from a substrate
b. Production of a toxin from a nontoxic chemical
c. Oxidation of sugar to carbon dioxide
d. Use of microorganisms to modify substances not normally used for
growth
Question 10
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Which of the following is an example of a secondary metabolite?
Select one:
a. Toxin produced by species of Clostridium
b. Alcohol produced by Saccharomyces during fermentation
c. Lactic acid made during yogurt production.
d. All of these are secondary metabolites.
Question 11
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All of the following pertain to transcription except
Select one:
a. it occurs on a ribosome in the cytoplasm.
b. it occurs before translation.
c. it requires RNA polymerase.
d. it requires a template DNA strand.
e. it is a process that contributes to the synthesis of protein.Question 12
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The nontranscribed region of DNA to which RNA polymerase binds to
initiate transcription is called the ________.
Select one:
a. promoter
b. operator
c. operon
d. exon
e. intron
Question 13
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If a codon for alanine is GCA, then the anticodon is ______.
Select one:
a. GCA
b. CGTc. ACG
d. CGU
e. UGC
Question 14
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Of the following list, which antibiotics affect protein synthesis?
Select one:
a. Penicillin
b. Tetracycline
c. Chloramphenicol
d. Ciprofloxacin
e. Both tetracycline and chloramphenicol are correct.
Question 15
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Which of the following is not true of transposons?Select one:
a. They can change pigmentation.
b. They can replace damaged DNA.
c. They can transfer drug resistance.
d. They can change the genome.
e. They are always part of plasmids.
Question 16
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Your infant has been diagnosed with severe combined
immunodeficiency disease (SCID). Your doctor suggests which
treatment as a possible cure for the disease?
Select one:
a. Gene therapy
b. Genome mapping
c. Reverse transcription
d. Microarrays
Question 17
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Which of the following is not true of vectors?
Select one:
a. An origin of replication (ORI) is present.
b. They must accept DNA of desired size.
c. They contain a gene for drug resistance.
d. They are easy to manipulate.
e. They can detect RNA in cells.
Question 18
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Transgenic animals are referred to as _____ modified organisms.
Select one:
a. genetically
b. naturally
c. chemically
d. physically
Question 19Correct
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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
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 productiond. Tissue plasminogen activating factor - stimulates blood clotting [Show Less]