Straighterline Microbiology BIO250 Final Exam
Frequently Tested Questions
| 100% Correct Answers
lichens are an example of what type of relationship:
A. co-metabolism
B. mutualism
C. parasitism
D. synergism - ✔✔B. mutualism
in water quality assessment, which bacterium is used as an indicator organism?
A. salmonella
B. corynebacterium
C. escherichia coli
D. clostridium - ✔✔C. escherichia coli
A collection of organisms, together with their physical and chemical factors, are called a/an
A. atmosphere.
B. biosphere.
C. lithosphere.
D. hydrosphere.
E. ecosystem. - ✔✔E. ecosystem.
The energy of the sun is converted into chemical energy during
A. ammonification.
B. nitrogen fixation.
,C. photosynthesis.
D. nitrification.
E. denitrification. - ✔✔C. photosynthesis.
Eutrophication
A. is characterized by heavy surface algal blooms.
B. can block the O2 supply to the lake.
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. - ✔✔E. All of the choices are correct.
You have been using massive amounts of weed killer and insecticide chemicals to knock out all of those
pesky 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?
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. - ✔✔E. All of the above.
The study of the practical use of microbes in various industries and technologies is
A. applied microbiology.
B. biotechnology.
C. bioengineering.
D. microbial ecology.
E. industrial microbiology. - ✔✔A. applied microbiology.
The final treatment of sewage before release into the environment is
A. sludge digesting.
,B. skimming.
C. filtration.
D. chlorination.
E. aeration. - ✔✔A. sludge digesting.
What chemical is used in both water purification and sewage treatment to give long-term disinfection?
A. fluorine
B. activated charcoal
C. copper sulfate
D. chlorine - ✔✔D. chlorine
The slowly decaying organic litter from plant and animal tissues that is found in the soil is called
A. a biofilm.
B. aggregate.
C. the lithosphere.
D. detritus.
E. compost - ✔✔D. detritus.
You have never seen a container of jelly go bad or be contaminated with microbial growth, even though
it is continuously used for months at a time. Which is the best explanation?
A. Jelly is pasteurized.
B. Jelly has a high osmotic pressure.
C. Jelly is filter sterilized.
D. A variety of chemicals are added to jelly to make it inhospitable for bacteria. - ✔✔B. Jelly has a
high osmotic pressure.
Which statement is true regarding pasteurization?
A. It does not kill all microorganisms in milk.
B. The process was first used in the wine industry.
, C. During pasteurization the heating is done very quickly as to not change the integrity and taste of the
product.
D. All statements are true. - ✔✔D. All statements are true.
Potable water must be:
A. absolutely clear.
B. free of pathogens.
C. totally free of microorganisms.
D. free of all elements. - ✔✔B. free of pathogens.
Which of the following pathogens does not match its condition?
A. E. coli - diarrhea
B. Vibrio cholerae - cholera
C. Shigella dysenteriae - dysentery
D. Saccharomyces cerevisiae - vomiting
E. Listeria monocytogenes - listeriosis - ✔✔D. Saccharomyces cerevisiae - vomiting
The products of yeast fermentation in breads are
A. ethanol and water.
B. ethanol and carbon dioxide.
C. carbon dioxide and water.
D. lactic acid and water.
E. lactic acid and carbon dioxide - ✔✔C. carbon dioxide and water.
Which step in making beer involves soaking malt grain, grinding it, and heating with sugar and starch?
A. preparing a mash
B. malting
C. aging
D. wort boiled with hops
Frequently Tested Questions
| 100% Correct Answers
lichens are an example of what type of relationship:
A. co-metabolism
B. mutualism
C. parasitism
D. synergism - ✔✔B. mutualism
in water quality assessment, which bacterium is used as an indicator organism?
A. salmonella
B. corynebacterium
C. escherichia coli
D. clostridium - ✔✔C. escherichia coli
A collection of organisms, together with their physical and chemical factors, are called a/an
A. atmosphere.
B. biosphere.
C. lithosphere.
D. hydrosphere.
E. ecosystem. - ✔✔E. ecosystem.
The energy of the sun is converted into chemical energy during
A. ammonification.
B. nitrogen fixation.
,C. photosynthesis.
D. nitrification.
E. denitrification. - ✔✔C. photosynthesis.
Eutrophication
A. is characterized by heavy surface algal blooms.
B. can block the O2 supply to the lake.
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. - ✔✔E. All of the choices are correct.
You have been using massive amounts of weed killer and insecticide chemicals to knock out all of those
pesky 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?
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. - ✔✔E. All of the above.
The study of the practical use of microbes in various industries and technologies is
A. applied microbiology.
B. biotechnology.
C. bioengineering.
D. microbial ecology.
E. industrial microbiology. - ✔✔A. applied microbiology.
The final treatment of sewage before release into the environment is
A. sludge digesting.
,B. skimming.
C. filtration.
D. chlorination.
E. aeration. - ✔✔A. sludge digesting.
What chemical is used in both water purification and sewage treatment to give long-term disinfection?
A. fluorine
B. activated charcoal
C. copper sulfate
D. chlorine - ✔✔D. chlorine
The slowly decaying organic litter from plant and animal tissues that is found in the soil is called
A. a biofilm.
B. aggregate.
C. the lithosphere.
D. detritus.
E. compost - ✔✔D. detritus.
You have never seen a container of jelly go bad or be contaminated with microbial growth, even though
it is continuously used for months at a time. Which is the best explanation?
A. Jelly is pasteurized.
B. Jelly has a high osmotic pressure.
C. Jelly is filter sterilized.
D. A variety of chemicals are added to jelly to make it inhospitable for bacteria. - ✔✔B. Jelly has a
high osmotic pressure.
Which statement is true regarding pasteurization?
A. It does not kill all microorganisms in milk.
B. The process was first used in the wine industry.
, C. During pasteurization the heating is done very quickly as to not change the integrity and taste of the
product.
D. All statements are true. - ✔✔D. All statements are true.
Potable water must be:
A. absolutely clear.
B. free of pathogens.
C. totally free of microorganisms.
D. free of all elements. - ✔✔B. free of pathogens.
Which of the following pathogens does not match its condition?
A. E. coli - diarrhea
B. Vibrio cholerae - cholera
C. Shigella dysenteriae - dysentery
D. Saccharomyces cerevisiae - vomiting
E. Listeria monocytogenes - listeriosis - ✔✔D. Saccharomyces cerevisiae - vomiting
The products of yeast fermentation in breads are
A. ethanol and water.
B. ethanol and carbon dioxide.
C. carbon dioxide and water.
D. lactic acid and water.
E. lactic acid and carbon dioxide - ✔✔C. carbon dioxide and water.
Which step in making beer involves soaking malt grain, grinding it, and heating with sugar and starch?
A. preparing a mash
B. malting
C. aging
D. wort boiled with hops
