Wednesday, October 16, 2019, 1:33 AM
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Completed on Wednesday, October 16, 2019, 2:20 AM
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Question 1
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You are "living off the grid" meaning that you are not using any public utilities: no water supply, sewer
connection, natural gas, or electricity. You do have a septic tank, whose pipe carries sewage
underground where it is released over a wide area, the leaching field. There is also a small pond out
there that you have stocked with fish. However, you notice that the fish are floating dead in the water,
and the pond has a green scum on it. What happened?
Select one:
a. Chemical toxins from your septic tank cleaner have killed the fish.
b. There are not enough nutrients in the water, so the fish died.
c. There is oxygen depletion in the pond due to the leakage of phosphates and other compounds
from your septic tank.
d. The fish died due to a lack of calcium, which then caused the algae to overgrow.
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The correct answer is: There is oxygen depletion in the pond due to the leakage of phosphates and other
compounds from your septic tank.
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3Question 2
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Why are waterlogged soils often infertile?
Select one:
a. Nitrifying bacteria require oxygen, and the excess water takes the place of oxygen-containing air.
b. Water molecules are used instead of oxygen for cellular respiration.
c. The lack of physical space in this type of soil blocks bacterial growth.
d. There is less carbon in waterlogged soil than dry soil.
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The correct answer is: Nitrifying bacteria require oxygen, and the excess water takes the place of oxygencontaining air.
Question 3
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3The mutualistic partnership between plant roots and microbes is ______.
Select one:
a. hyphae
b. basidia
c. mycorrhizae
d. rhizopods
e. lichens
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The correct answer is: mycorrhizae
Question 4
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The terrestrial realm of the biosphere is distributed into particular climatic regions called ______.
Select one:
a. niches
b. habitats
c. populations
d. communities
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3e. biomes
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The correct answer is: biomes
Question 5
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The thin envelope of life that surrounds the earth's surface is called the ______.
Select one:
a. atmosphere
b. biosphere
c. lithosphere
d. hydrosphere
e. ecosystem
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The correct answer is: biosphere
Question 6
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A pure or mixed sample of known microbes added to food is a(n) ______.
Select one:
a. leavening
b. fermenter
c. starter culture
d. flavor inducer
e. aerator
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The correct answer is: starter culture
Question 7
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Analysis of a water sample by a series of presumptive, confirmatory, and completed tests that provide an
estimate of coliform numbers in the water is called the ______.
Select one:
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3a. membrane filter method
b. most probable number (MPN)
c. standard plate count
d. coliform count
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The correct answer is: most probable number (MPN)
Question 8
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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.
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The correct answer is: Toxin produced by species of Clostridium
Question 9
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3Correct
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An organism used to make a variety of industrial enzymes by fermentation is ______.
Select one:
a. Penicillium
b. E. coli
c. Salmonella
d. Aspergillus
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The correct answer is: Aspergillus
Question 10
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Which of the following activities uses microbial biotransformation?
Select one:
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3a. Sewage treatment
b. Alcohol production
c. Yogurt production
d. Production of antibiotics
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The correct answer is: Production of antibiotics
Question 11
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DNA Polymerase I
Select one:
a. removes primers.
b. adds bases to new DNA chain.
c. seals DNA gaps.
d. proofreads DNA chain.
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The correct answer is: removes primers.
Question 12
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3Correct
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RNA polymerase binds to the
Select one:
a. start codon.
b. termination sequence.
c. regulation sequence.
d. promoter sequence.
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The correct answer is: promoter sequence.
Question 13
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Structural genes code for
Select one:
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3a. ribosomal RNA molecules.
b. transfer RNA molecules.
c. cellular proteins.
d. gene expression elements.
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The correct answer is: cellular proteins.
Question 14
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The process in which mutations are removed and the correct bases added is called ________.
Select one:
a. transduction
b. excision repair
c. frameshift
d. back-mutation
e. transformation
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The correct answer is: excision repair
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3Question 15
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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?
Select one:
a. Transduction
b. Conjugation
c. Transformation
d. Cloning
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The correct answer is: Transformation
Question 16
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qaid=56242921&q 0Making new genomes is called ______.
Select one:
a. bioengineering
b. synthetic biology
c. genetic engineering
d. cloning
e. recombinant DNA
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The correct answer is: synthetic biology
Question 17
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DNA strands can be clipped crosswise at selected positions by using enzymes called ______.
Select one:
a. palindromes
b. reverse transcriptases
c. restriction endonucleases
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3d. ligases
e. DNA polymerases
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The correct answer is: restriction endonucleases
Question 18
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Which step in gene mapping involves transformation?
Select one:
a. Target DNA removed from cells and isolated
b. Cloning host receives plasmid
c. Target DNA and plasmid treated with the same restriction endonuclease
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: Cloning host receives plasmid
Question 19
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Transgenic animals are referred to as _____ modified organisms.
Select one:
a. genetically
b. naturally
c. chemically
d. physically
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The correct answer is: genetically
Question 20
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What type of DNA map is most detailed?
Select one:
a. Linkage
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3b. Sequence
c. Physical
d. Geographical
e. Chromosomal
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The correct answer is: Sequence
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