Question 1

An organism that cannot grow without oxygen is a(n) ______.

Accepted Answer

A)   aerobe
B)   obligate aerobe
C)   facultative anaerobe
D)   microaerophile
E)   obligate anaerobeF) A) and C)
G) A) and E)

Question 2

Bacteria like E.coli have an average generation time of 24 hours.

Accepted Answer

A) True 
 B)False

Question 3

An important mineral ion that is a component of chlorophyll and serves as a stabilizer of membranes and ribosomes is ______.

Accepted Answer

A)   zinc
B)   iron
C)   calcium
D)   magnesium
E)   potassiumF) A) and B)
G) A) and C)

Question 4

Which statement is correct regarding microbial growth on food at refrigeration temperatures?

Accepted Answer

A)   The absence of light in the refrigerator greatly reduces the growth of most microbial pathogens.
B)   Most food does not have enough oxygen content for microorganisms to thrive.
C)   There is no growth of microbes in food in the refrigerator; the cold temperature kills or inactivates microbial cells.
D)   The growth of microbes in food depends on their optimal growth temperature; some grow slowly and others faster.E) C) and D)
F) B) and D)

Question 5

After binary fission,daughter cells will differ genetically.

Accepted Answer

A) True 
 B)False

Question 6

Cultures of a bacterial strain were incubated in a standard incubator,in an anaerobic jar,and in a candle jar.After incubation,there was moderate growth of cultures in the candle and anaerobic jars,but heavy growth of the culture in the incubator.This species is a(n) ______.

Accepted Answer

A)   facultative anaerobe
B)   anaerobe
C)   microaerophile
D)   obligate aerobe
E)   capnophileF) A) and E)
G) A) and C)

Question 7

A microaerophile

Accepted Answer

A)   grows with or without oxygen.
B)   needs normal atmospheric levels of oxygen.
C)   requires a small amount of oxygen but won't grow at normal atmospheric levels of oxygen.
D)   grows best in an anaerobic jar.E) A) and B)
F) None of the above

Question 8

An important mineral ion found in the cytochrome pigments of cellular respiration is ______.

Accepted Answer

A)   zinc
B)   magnesium
C)   calcium
D)   iron
E)   potassiumF) All of the above
G) A) and B)

Question 9

An organism that can use gaseous oxygen in metabolism and has the enzymes to process toxic oxygen products is a(n) ______.

Accepted Answer

A)   aerobe
B)   microaerophile
C)   facultative anaerobe
D)   obligate anaerobeE) A) and B)
F) None of the above

Question 10

Human pathogens fall into the group called ______.

Accepted Answer

A)   halophiles
B)   thermophiles
C)   acidophiles
D)   mesophiles
E)   psychrophilesF) A) and E)
G) B) and D)

Question 11

Many lakes in the United States are suffering from periodic algae blooms,which can be thought of as an infection of the lake.Although the algae are naturally-occurring in the lake,when adjacent farm fields are over-fertilized with diammonium phosphate,the run-off deposits these nutrients in the lake,allowing the algae to grow without limit.Which of the following statements is incorrect regarding the overgrowth of algae?

Accepted Answer

A)   Lakes have sufficient micronutrients for algae to grow.
B)   The algae are heterotrophs.
C)   The nitrogen in the fertilizer is in the ammonium form, the preferred nitrogen source of most microbes.
D)   The phosphorus in the fertilizer is in the phosphate form, the preferred phosphorus source of most microbes.
E)   The carbon source for these algae is not limiting in lakes.F) D) and E)
G) All of the above

Question 12

Most of the dry weight of a microbial cell is from ______.

Accepted Answer

A)   water
B)   minerals
C)   inorganic compounds
D)   organic compounds
E)   saltsF) B) and E)
G) B) and C)

Question 13

The movement of substances from lower to higher concentration across a semipermeable membrane via a specific protein carrier and cell expenditure of energy is called ______.

Accepted Answer

A)   osmosis
B)   diffusion
C)   active transport
D)   endocytosis
E)   facilitated diffusionF) A) and E)
G) C) and D)

Question 14

What type of medium is used to demonstrate oxygen requirements of microbes?

Accepted Answer

A)   Sodium chloride
B)   Blood agar
C)   Sulfite polymyxin sulfadiazine
D)   ThioglycollateE) B) and C)
F) A) and B)

Question 15

The term obligate refers to

Accepted Answer

A)   existing in a very narrow niche.
B)   using chemicals for energy production.
C)   the ability to exist in a wide range of conditions.
D)   using oxygen for metabolism.
E)   using light for energy production.F) A) and B)
G) C) and E)

Question 16

Cultures of a bacterial strain were incubated in a refrigerator (5°C) ,on a lab bench (22°C) ,in a 37°C incubator,and in a 50°C incubator.After incubation,there was no growth at 37°C and 50°C,slight growth in the refrigerator,and abundant growth on the lab bench top.Which term best describes this organism?

Accepted Answer

A)   Halophile
B)   Psychrotroph
C)   Capnophile
D)   Mesophile
E)   AnaerobeF) B) and D)
G) All of the above

Question 17

Following the Deepwater Horizon accident in the Gulf of Mexico in 2010,bioremediation was used to eliminate much of the oil from the contaminated water.To encourage the growth of oil-degrading microbes,"fertilizer" including iron and nitrogen was added to the water.Which of the following statements regarding the growth of these microbes is incorrect?

Accepted Answer

A)   The concentration of sulfate in the Gulf of Mexico is sufficient for the growth of oil-degrading microbes.
B)   Large amounts of iron were needed, as iron is a macronutrient for oil-degrading microbes.
C)   Nitrogen gas (N2)  present in air is not in a form that can be used by oil-degrading microbes.
D)   The oil-degrading microbes used oil (hydrocarbons)  as their carbon source.E) C) and D)
F) A) and B)

Question 18

You inoculate a bacterium into three tubes of nutrient broth medium containing added salt: 0.5% NaCl,5% NaCl,and 15% NaCl.After incubation,you notice significant turbidity in the 15% NaCl medium and modest turbidity in the 5% NaCl medium.There is no growth in the third tube.This organism would be termed ______.

Accepted Answer

A)   osmophobic
B)   halophilic
C)   haloduric
D)   barophilicE) A) and B)
F) All of the above

Question 19

The majority of microbes live and grow in habitats between pH 7 and 9.

Accepted Answer

A) True 
 B)False

Question 20

What is the difference between mutualism and synergism?

Accepted Answer

A)   In a synergistic relationship, both organisms benefit, but in a mutualistic relationship both organisms are harmed.
B)   In a mutualistic relationship, both organisms benefit, but in a synergistic relationship both organisms are harmed.
C)   In a synergistic relationship, the organisms cannot survive without each other.
D)   In a mutualistic relationship, the organisms are dependent upon each other.E) A) and C)
F) A) and D)

Exam 15: Host Defenses II: Specific Immunity and Immunization

What is the difference between mutualism and synergism?

Correct Answer
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Correct Answer
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Correct Answer
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The majority of microbes live and grow in habitats between pH 7 and 9.

Correct Answer
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Which statement is correct regarding microbial growth on food at refrigeration temperatures?

Correct Answer
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An important mineral ion found in the cytochrome pigments of cellular respiration is ______.

Correct Answer
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A microaerophile

Correct Answer
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What type of medium is used to demonstrate oxygen requirements of microbes?

Correct Answer
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Correct Answer
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An important mineral ion that is a component of chlorophyll and serves as a stabilizer of membranes and ribosomes is ______.

Correct Answer
verified

An organism that cannot grow without oxygen is a(n) ______.

Correct Answer
verified

The movement of substances from lower to higher concentration across a semipermeable membrane via a specific protein carrier and cell expenditure of energy is called ______.

Correct Answer
verified

Correct Answer
verified

An organism that can use gaseous oxygen in metabolism and has the enzymes to process toxic oxygen products is a(n) ______.

Correct Answer
verified

The term obligate refers to

Correct Answer
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Cultures of a bacterial strain were incubated in a standard incubator,in an anaerobic jar,and in a candle jar.After incubation,there was moderate growth of cultures in the candle and anaerobic jars,but heavy growth of the culture in the incubator.This species is a(n) ______.

Correct Answer
verified

Bacteria like E.coli have an average generation time of 24 hours.

Correct Answer
verified

After binary fission,daughter cells will differ genetically.

Correct Answer
verified

Human pathogens fall into the group called ______.

Correct Answer
verified

Most of the dry weight of a microbial cell is from ______.

Correct Answer
verified

Exam 15: Host Defenses II: Specific Immunity and Immunization

What is the difference between mutualism and synergism?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The majority of microbes live and grow in habitats between pH 7 and 9.

Correct AnswerverifiedShow Answer

Which statement is correct regarding microbial growth on food at refrigeration temperatures?

Correct AnswerverifiedShow Answer

An important mineral ion found in the cytochrome pigments of cellular respiration is ______.

Correct AnswerverifiedShow Answer

A microaerophile

Correct AnswerverifiedShow Answer

What type of medium is used to demonstrate oxygen requirements of microbes?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

An important mineral ion that is a component of chlorophyll and serves as a stabilizer of membranes and ribosomes is ______.

Correct AnswerverifiedShow Answer

An organism that cannot grow without oxygen is a(n) ______.

Correct AnswerverifiedShow Answer

The movement of substances from lower to higher concentration across a semipermeable membrane via a specific protein carrier and cell expenditure of energy is called ______.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

An organism that can use gaseous oxygen in metabolism and has the enzymes to process toxic oxygen products is a(n) ______.

Correct AnswerverifiedShow Answer

The term obligate refers to

Correct AnswerverifiedShow Answer

Cultures of a bacterial strain were incubated in a standard incubator,in an anaerobic jar,and in a candle jar.After incubation,there was moderate growth of cultures in the candle and anaerobic jars,but heavy growth of the culture in the incubator.This species is a(n) ______.

Correct AnswerverifiedShow Answer

Bacteria like E.coli have an average generation time of 24 hours.

Correct AnswerverifiedShow Answer

After binary fission,daughter cells will differ genetically.

Correct AnswerverifiedShow Answer

Human pathogens fall into the group called ______.

Correct AnswerverifiedShow Answer

Most of the dry weight of a microbial cell is from ______.

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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