MCB 100 Past Exams Questions With Complete
SOLUTIONS
1. A microorganism that uses CO2 as a carbon source and
generates energy from light is an example of a
- Chemoorgranoheterotroph
- photoheterotroph
- chemolithoautotroph
- photoautotroph
- chemoorganolithotroph Correct Answers photoautotroph
1. Interpret the graph below to determine when Ignaz
semmelqeis started making handwashing with chlorinated lime
mandatory at the vienna gernal hospital. Correct Answers
Summer of 1847 (when deaths decreased drastically)
10. What is the doubling time for this bacteria Correct
Answers ...
10. Which of the following statements about prokaryotic or
eukaryotic cells is incorrect?
- Some eukaryotes generate methane
- prokaryotes have nucleoids
- some prokaryotes have lipopolysaccharide (LPS) on their
surface
- eukaryotes have a nucleus
- eukaryotes have membrane-enclosed organelles Correct
Answers - Some eukaryotes generate methane
,11. What is the doubling time of the E Coli. strain depicted in
the growth curve below? Correct Answers - 50min
The amount of time for a population to double in size
11. Which of the following statements about prokaryotic or
eukaryotic cells is incorrect?
- All eukaryotes have membrane enclosed organelles
- all prokaryotes have nucleoids
- some prokaryotes have lipopolysaccharide (LPS) on their
surface
- all prokaryotee generate methane
- all eukaryotes have a nucleus Correct Answers all prokaryotee
generate methane
12. Which of the following cultures depicts the growth of
obligate aerobes? Correct Answers A / 1 (requires oxygen to
grow)
12. Which of the following tubes depicts a culture of
aerotolerant anaerobes ? Correct Answers 5 , capable of
growing without a problem with no O2
13. Which of the following is NOT an application of
bioremediation?
- Treating oil spills with petroleum eating microbes
- treating sewage with bacteria to oxidize organic matter
- Burning petroleum products floating on the surface of the sea
- Using archaea to metabolize organic molecules into methane
gas
, - Removal of plastics by fungi that digest polyethylene
compounds Correct Answers - Burning petroleum products
floating on the surface of the sea
Bioremediation : uses organisms to clean up toxic, hazardous, or
recalcitrant compounds,degrading them to harmless compounds•
Well-known application is use of microbes to clean oil spills
13. Why is polluted mine drainage visibly red - orange in color?
- Growth of red and orange pigmented bacteria on acidic ferric
iron from mines
- Bacteria from soluble ferrous iron compounds that are visibly
red or orange
- The presence of a strong base in the mine extraction process
catalyzes the formation of insoluble iron precipitates that are
orange
- Due to accumulation of insoluble red - orange ferric iron
precipitates under acid pH conditions
- Due to red and orange rust formation on exposed iron ore
Correct Answers Due to accumulation of insoluble red - orange
ferric iron precipitates under acid pH conditions
14. Which of the following locations would support the
GREATEST microbial biodiversity and biomass?
- Glacier
- Hot springs
- Bedrock
- Ocean surface
- bottom of a deep mountain lake Correct Answers - Ocean
surface
SOLUTIONS
1. A microorganism that uses CO2 as a carbon source and
generates energy from light is an example of a
- Chemoorgranoheterotroph
- photoheterotroph
- chemolithoautotroph
- photoautotroph
- chemoorganolithotroph Correct Answers photoautotroph
1. Interpret the graph below to determine when Ignaz
semmelqeis started making handwashing with chlorinated lime
mandatory at the vienna gernal hospital. Correct Answers
Summer of 1847 (when deaths decreased drastically)
10. What is the doubling time for this bacteria Correct
Answers ...
10. Which of the following statements about prokaryotic or
eukaryotic cells is incorrect?
- Some eukaryotes generate methane
- prokaryotes have nucleoids
- some prokaryotes have lipopolysaccharide (LPS) on their
surface
- eukaryotes have a nucleus
- eukaryotes have membrane-enclosed organelles Correct
Answers - Some eukaryotes generate methane
,11. What is the doubling time of the E Coli. strain depicted in
the growth curve below? Correct Answers - 50min
The amount of time for a population to double in size
11. Which of the following statements about prokaryotic or
eukaryotic cells is incorrect?
- All eukaryotes have membrane enclosed organelles
- all prokaryotes have nucleoids
- some prokaryotes have lipopolysaccharide (LPS) on their
surface
- all prokaryotee generate methane
- all eukaryotes have a nucleus Correct Answers all prokaryotee
generate methane
12. Which of the following cultures depicts the growth of
obligate aerobes? Correct Answers A / 1 (requires oxygen to
grow)
12. Which of the following tubes depicts a culture of
aerotolerant anaerobes ? Correct Answers 5 , capable of
growing without a problem with no O2
13. Which of the following is NOT an application of
bioremediation?
- Treating oil spills with petroleum eating microbes
- treating sewage with bacteria to oxidize organic matter
- Burning petroleum products floating on the surface of the sea
- Using archaea to metabolize organic molecules into methane
gas
, - Removal of plastics by fungi that digest polyethylene
compounds Correct Answers - Burning petroleum products
floating on the surface of the sea
Bioremediation : uses organisms to clean up toxic, hazardous, or
recalcitrant compounds,degrading them to harmless compounds•
Well-known application is use of microbes to clean oil spills
13. Why is polluted mine drainage visibly red - orange in color?
- Growth of red and orange pigmented bacteria on acidic ferric
iron from mines
- Bacteria from soluble ferrous iron compounds that are visibly
red or orange
- The presence of a strong base in the mine extraction process
catalyzes the formation of insoluble iron precipitates that are
orange
- Due to accumulation of insoluble red - orange ferric iron
precipitates under acid pH conditions
- Due to red and orange rust formation on exposed iron ore
Correct Answers Due to accumulation of insoluble red - orange
ferric iron precipitates under acid pH conditions
14. Which of the following locations would support the
GREATEST microbial biodiversity and biomass?
- Glacier
- Hot springs
- Bedrock
- Ocean surface
- bottom of a deep mountain lake Correct Answers - Ocean
surface
