Question 1
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Considering the human body as an ecosystem, which of the following statementsis
incorrect?
Select one:
a.
... [Show More] 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.
Question 2
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The conversion of nitrate (NO3 ) to- nitrogen gas (N2) is called .
Select one:
a. ammonification
b. nitrogen fixation
c. photosynthesis
d. nitrification
e. denitrification
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BIO250_Saylor_V5 | Unit 24: Genetic Engineering and Recombinant DNA
Started on Monday, April 12, 2021, 10:10 AM
State Finished
Completed on Monday, April 12, 2021, 10:53 AM
Time taken 42 mins 37 secs
Grade 85.50 out of 90.00 (95%)4/15/2021 Graded Exam 6
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Question 3
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Consider a deep sea hydrothermal vent. Which of the following statements isincorrect?
Select one:
a. Its biome is the deep marine biopshere.
b. The vent hosts communities of chemolithotrophic bacteria.
c. The vent is a habitat.
d. The associated chemolithotrophs are primary producers.
The slowly decaying organic litter from plant and animal tissues that is found inthe soil
is called .
Select one:
a. a biofilm
b. aggregate
c. the lithosphere
d. detritus
How are the sulfur cycle and the phosphate cycle interconnected?Select one:
a. Phosphate is released from rock and soil by sulfuric acid.
b. Phosphate is the nutrient source used by sulfur oxidizers.
c. Sulfite is the nutrient used by phosphate reducers.
d. Sulfate and phosphate react together to produce amino acids for protein
production.
Question 4
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Question 5
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Question 6
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You want to make wine that will be 20-25% alcohol, but wine rarely gets to that
concentration of alcohol. What can you do to accomplish your goal of high-yieldalcohol
production?
Select one:
a. Add more sugar to your starting material.
b. Let your fermentation go longer.
c. Find an alcohol-tolerant yeast strain.
d. Add brandy to your wine.
Which of the following is not a desired outcome from using microbes inmaking
bread?
Select one:
a. Leavening
b. Giving flavor and odor
c. Producing ethyl alcohol
d. Conditioning the dough to make it workable
e. Helping the dough rise
What type of radiation is best for destroying microbes throughout food?
Select one:
a. Ultraviolet
b. Visible light
c. Gamma rays
d. Infrared
e. Microwaves
Question 7
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Question 8
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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
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
A sequence of bases within a gene that does not code for protein is called a/n
.
Select one:
a. promoter
b. operator
c. operon
d. exon
e. intron
Question 10
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Question 11
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Question 12
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Gene regulation can involve a protein repressor that blocks from initiating
transcription.
Select one:
a. DNA polymerase I
b. DNA polymerase III
c. RNA polymerase
d. mRNA
e. rRNA
The enzyme that helps pack DNA into the cell by coiling the DNA into a tight bundleis
.
Select one:
a. DNA ligase
b. DNA polymerase
c. DNA helicase
d. DNA gyrase
e. primase
A mutation that changes a normal codon to a stop codon is called a
mutation.
Select one:
a. point
b. silent
c. back
d. missense
e. nonsense
Question 13
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Question 14
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6/8
Question 15
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A screening system called the test is used for detecting chemicals with
carcinogenic potential.
Select one:
a. Koch
b. Ames
c. mutation
d. cancer
e. Iowa
Which PCR step causes the denaturation of double-stranded DNA?
Select one:
a. Add DNA polymerase and nucleotides at 72° C.
b. Cool DNA to between 50° C and 65° C.
c. Add primers.
d. Heat target DNA to 94° C.
e. Repeat the cycle of heating and cooling.
Why is an enzyme from a thermophilic bacterium used in PCR?Select one:
a. The enzyme makes DNA that is more similar to human DNA.
b. It is cheaper to obtain from live microorganisms than producing the enzymein a lab.
c. This thermohile's enzyme will synthesize DNA.
d. DNA is replicated at a high temperature that denatures most proteins.
Question 16
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Question 17
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7/8
Question 18
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The commercial product Frostban consists of a genetically altered bacterium which
prevents ice crystals from forming on plants, thereby reducing freezing ofplants and
financial distress to the farmers as a result of freezing weather. Thisproduct contains a
strain of .
Select one:
a. Escherichia coli
b. Saccharomyces cerevisiae
c. Thermus aquaticus
d. Pseudomonas syringae
e. Pseudomonas nuorescens
The enzyme required to attach the sticky ends of DNA and used when splicingDNA
fragments into other DNA is .
Select one:
a. helicase
b. ligase
c. reverse transcriptase
d. endonuclease
The study of genomes of a particular community is called .
Select one:
a. metagenomics
b. genomics
c. proteomics
d. genomology
e. metabolomics [Show Less]