UIUC Mcb 100 Exam 1 MyLab Questions With Complete
Solutions
A bacterial culture that grows only near the surface of a
thioglycolate broth is an example of what type of organism?
Correct Answers Obligate aerobes
All eukaryotic cells contain most of their genetic material inside
what structure? Correct Answers A nucleus
All living cells take in nutrients, which provide building
materials and energy for a complex set of chemical reactions
inside the cell. What are these reactions called? Correct Answers
Metabolism
Among endospores, fimbriae, flagella, and inclusions, which
allow bacteria to survive very harsh conditions? Correct
Answers Endospores
An excess of which element is most often the cause of
eutrophication? Correct Answers Phosphorus
Are most microorganisms harmful or harmless to people?
Correct Answers Most microorganisms are harmless to people.
Are nutritional content, food processing, and food handling
intrinsic or extrinsic factors that affect spoilage? Correct
Answers Nutritional content is an intrinsic factor, and food
processing and food handling are extrinsic.
,At which stage of a microbial growth curve does a population
first slow down active growth? Correct Answers Stationary
phase
Bacteria may live as single cells or may cluster together in
specific arrangements. What prefix is used for organisms that
grow in chains? Correct Answers Strep
Baking bread, creating a genetically modified vegetable, using a
microbe to make human insulin . . . Which of these is NOT
considered "biotechnology"? Correct Answers All of these are
biotechnology (GMO veggie, bake bread, microbe to make
insulin)
Biofilms consist of several different organisms working in
complex relationships. These organisms communicate with each
other using what sort of chemicals? Correct Answers Quorum
sensing molecules
By which mechanism do microbes communicate with each other
in biofilm formation? Correct Answers Quorum sensing
Cells have buffers. What is the function of buffers inside cells?
Correct Answers Buffers resist changes in pH.
Consider bacteria, fungi, protozoa, and viruses. Which of these
is generally smallest in size? Correct Answers Viruses
During which phase of a microbial growth curve is the
population growing fastest? Correct Answers Log phase
, Eukaryotic cells contain steroid-based lipids in their cytoplasmic
membranes that help maintain membrane fluidity. What
example of this is found in animal cells? Correct Answers
Cholesterol
How does a noncompetitive inhibitor limit an enzyme's activity?
Correct Answers A noncompetitive inhibitor binds to an
allosteric site of the enzyme.
How does pickling preserve food? Correct Answers Most
pathogens cannot survive the low pH that results from pickling.
How is ribulose 1,5-bisphospate (RuBP) used in the first step of
the Calvin-Benson cycle? Correct Answers Three molecules of
RuBP and three molecules of CO2 react to form six molecules
of 3-phosphoglyceric acid.
If an environment is acidic, is its pH lower than, equal to, or
greater than 7? Correct Answers The pH is lower than 7.
In which deep lake zone do anaerobic photosynthetic bacteria
live? Correct Answers In the profundal zone
Large carbohydrates, such as starch and glycogen, are polymers.
What monomers compose large carbohydrates? Correct Answers
Monosaccharides
List these catabolic pathways—fermentation, anaerobic
respiration, and aerobic respiration—in order of the most energy
produced in the form of ATP to the least. Correct Answers
Aerobic respiration, anaerobic respiration, fermentation
Solutions
A bacterial culture that grows only near the surface of a
thioglycolate broth is an example of what type of organism?
Correct Answers Obligate aerobes
All eukaryotic cells contain most of their genetic material inside
what structure? Correct Answers A nucleus
All living cells take in nutrients, which provide building
materials and energy for a complex set of chemical reactions
inside the cell. What are these reactions called? Correct Answers
Metabolism
Among endospores, fimbriae, flagella, and inclusions, which
allow bacteria to survive very harsh conditions? Correct
Answers Endospores
An excess of which element is most often the cause of
eutrophication? Correct Answers Phosphorus
Are most microorganisms harmful or harmless to people?
Correct Answers Most microorganisms are harmless to people.
Are nutritional content, food processing, and food handling
intrinsic or extrinsic factors that affect spoilage? Correct
Answers Nutritional content is an intrinsic factor, and food
processing and food handling are extrinsic.
,At which stage of a microbial growth curve does a population
first slow down active growth? Correct Answers Stationary
phase
Bacteria may live as single cells or may cluster together in
specific arrangements. What prefix is used for organisms that
grow in chains? Correct Answers Strep
Baking bread, creating a genetically modified vegetable, using a
microbe to make human insulin . . . Which of these is NOT
considered "biotechnology"? Correct Answers All of these are
biotechnology (GMO veggie, bake bread, microbe to make
insulin)
Biofilms consist of several different organisms working in
complex relationships. These organisms communicate with each
other using what sort of chemicals? Correct Answers Quorum
sensing molecules
By which mechanism do microbes communicate with each other
in biofilm formation? Correct Answers Quorum sensing
Cells have buffers. What is the function of buffers inside cells?
Correct Answers Buffers resist changes in pH.
Consider bacteria, fungi, protozoa, and viruses. Which of these
is generally smallest in size? Correct Answers Viruses
During which phase of a microbial growth curve is the
population growing fastest? Correct Answers Log phase
, Eukaryotic cells contain steroid-based lipids in their cytoplasmic
membranes that help maintain membrane fluidity. What
example of this is found in animal cells? Correct Answers
Cholesterol
How does a noncompetitive inhibitor limit an enzyme's activity?
Correct Answers A noncompetitive inhibitor binds to an
allosteric site of the enzyme.
How does pickling preserve food? Correct Answers Most
pathogens cannot survive the low pH that results from pickling.
How is ribulose 1,5-bisphospate (RuBP) used in the first step of
the Calvin-Benson cycle? Correct Answers Three molecules of
RuBP and three molecules of CO2 react to form six molecules
of 3-phosphoglyceric acid.
If an environment is acidic, is its pH lower than, equal to, or
greater than 7? Correct Answers The pH is lower than 7.
In which deep lake zone do anaerobic photosynthetic bacteria
live? Correct Answers In the profundal zone
Large carbohydrates, such as starch and glycogen, are polymers.
What monomers compose large carbohydrates? Correct Answers
Monosaccharides
List these catabolic pathways—fermentation, anaerobic
respiration, and aerobic respiration—in order of the most energy
produced in the form of ATP to the least. Correct Answers
Aerobic respiration, anaerobic respiration, fermentation
