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Homework answers / question archive / University of Houston MICRO 3332 Quiz 4 1)Barophilic prokaryotes are found primarily a

University of Houston MICRO 3332 Quiz 4 1)Barophilic prokaryotes are found primarily a

Biology

University of Houston

MICRO 3332

Quiz 4

1)Barophilic prokaryotes are found primarily

a.            On cold mountains

b.            In environments enriched in the element barium

c.             In the human gastrointestinal tract

d.            Deep in the ocean

2.            Which of the following among A-D is incorrect?

a.            Microaerophiles possess SOD and catalase, but not at the same levels as an obligate aerobe

b.            Aerotolerant anaerobes are able to use oxygen for growth

c.             Obligate anaerobes cannot tolerate the presence of oxygen

d.            In fluid thioglycollate medium, facultative anaerobes exhibit growth throughout the medium, but show more growth at the air:medium interface

e.            A-D are all correct statements

3.            The flavor, texture, and appearance of a food or beverage are least likely to be affected by which process, or processes, of reducing microbial numbers?

a.            Pasteurization

b.            Steam sterilization

c.             Filtration

d.            Heating for two hours at 500°C in an oven

e.            Two of the above are correct

4.            Bacteria capable of thriving in aquatic environments where the external osmolarity is very high would likely be considered

a.            Barophilic

b.            Alkaliphilic

c.             Mesophilic

d.            Hyperthermophilic

e.            Halophilic

5.            A bacterium capable of withstanding an elevated temperature of 80°C-85°C exhibits a generation time of 2 hours at this temperature range, compared to a generation time of 8 hours when growing at 25°C. These observations would lead you to believe this bacterium is

a.            A thermophile

b.            Thermotolerant c.           A mesophile

d.            A hyperthermophile

e.            Two of the above are correct

6.            Assume 10^9 E. coli cells/ml are in a flask. Which graph in the figure best depicts an incorrect or false representation of the effect of an addition of an antimicrobial agent to the culture at time x? The y-axis represents the viable

 

cell count (as log value)

 

a.            A

b.            B

c.             C

d.            A, B, and C are all incorrect representations

e.            Two of A, B, and C are incorrect representations

7.            Which of the following statements is true?

a.            The decimal reduction time is the time for a population to be reduced by 50% following application of an antimicrobial agent or physical condition

b.            An antimicrobial agent exhibiting bactericidal activity would always show a decrease in viable count

c.             Sanitation is the same thing as sterilization

d.            121°C @ 15psi for 20 minutes are standard conditions for pasteurization

e.            Two of A-D are true

8.            For many bacterial types, this component is an absolute requirement for growth, for others it may be toxic, and still for others, some can live with or without it. This component is

a.            Carbon

b.            O2

c.             Sulfur

d.            Phosphorous

e.            Nitrogen

9.            Which of the following is false regarding control of microbial growth? a. Gases such as ethylene oxide are effective disinfectant agents for

plastics due to its ability to penetrate these materials

b.            Bacteria are more likely to become resistant to a disinfectant, if that disinfectant is present at a low concentration

c.             Pasteurization is generally an adequate sterilization method for food and beverages

d.            Antiseptics are generally not as concentrated or as strong as disinfectant solutions

10.          The N2 to NH3 reaction of these photosynthesizers is compartmentalized due to its oxygen sensitivity. Which process is this?

 

a.            Biofilm formation

b.            Endospore formation

c.             Gliding motility in Myxococcus

d.            Heterocyst formation in Cyanobacteria

 

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