Question 1

Which compound has the highest concentration in a cell?

Accepted Answer

A)   NH3
B)   CO2
C)   H2O
D)   CH4
E)   GlucoseF) A) and B)
G) C) and D)

Question 2

A microorganism that has an optimum growth temperature of 37°C,but can survive short exposure to high temperatures is called a(n) ______.

Accepted Answer

A)   thermophile
B)   psychrophile
C)   thermoduric microbe
D)   extremophile
E)   facultative psychrophileF) A) and C)
G) D) and E)

Question 3

The methanogens,producers of methane gas,require environments that

Accepted Answer

A)   have abundant oxygen and CO2.
B)   are directly exposed to sunlight.
C)   are extremely cold.
D)   are very acidic.
E)   are anaerobic with hydrogen gas and CO2.F) A) and D)
G) A) and B)

Question 4

The process by which a cell uses ATP to enclose a substance in its membrane,by forming a vacuole and engulfing it,is called ______.

Accepted Answer

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

Question 5

When it is important to count the number of cells,determine cell size,and differentiate between dead and live cells,a(n) ______ is used.

Accepted Answer

A)   SEM
B)   Coulter counter
C)   methylene indicator dye
D)   flow cytometer
E)   spectrophotometerF) B) and E)
G) None of the above

Question 6

Inorganic nitrogen must be converted to ammonia to be used by a cell.

Accepted Answer

A) True 
 B)False

Question 7

An organism that uses CO2 for its carbon needs and sunlight for its energy needs would be called a ______.

Accepted Answer

A)   chemoheterotroph
B)   halotroph
C)   saprobe
D)   photoautotroph
E)   heterotrophF) C) and D)
G) A) and B)

Question 8

The movement of substances from higher to lower concentration across a semipermeable membrane via a specific protein carrier but without energy expenditure is called ______.

Accepted Answer

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

Question 9

The toxic superoxide ion is converted to harmless oxygen by two enzymes,

Accepted Answer

A)   superoxide dismutase and hydrogen peroxidase.
B)   superoxide dismutase and oxidase.
C)   superoxide dismutase and catalase.
D)   catalase and hydrogen peroxidase.
E)   catalase and oxidase.F) A) and E)
G) All of the above

Question 10

Most microorganisms can only grow in habitats that are similar to human body conditions.

Accepted Answer

A) True 
 B)False

Question 11

A closed culture system is used to determine a population growth curve.

Accepted Answer

A) True 
 B)False

Question 12

In a commensal relationship,the commensal benefits but the cohabitant is neither harmed nor benefited.

Accepted Answer

A) True 
 B)False

Question 13

In the viable plate count method,a measured volume of a culture is evenly spread across an agar surface and incubated.Each _____ represents one _____ from the original sample.

Accepted Answer

A)   cell; colony
B)   colony; cell
C)   generation; cell
D)   species; colony
E)   cell; cellF) B) and C)
G) A) and B)

Question 14

Anaerobes can be cultured in a CO2 environment.

Accepted Answer

A) True 
 B)False

Question 15

E.coli bacteria normally live in the human gut and produce vitamin K that the body uses.This is best termed a ______ relationship.

Accepted Answer

A)  mutualistic
B)  saprobic
C)  parasitic
D)  antagonisticE) B) and C)
F) A) and B)

Question 16

An organic nutrient that cannot be synthesized by the organism and must be provided is called a(n)  ______.

Accepted Answer

A)   element
B)   trace element
C)   growth factor
D)   macronutrient
E)   compoundF) A) and B)
G) A) and E)

Question 17

As described in "A Note About Bacterial Reproduction -- and the "Culture Bias,"" the organism Epulopiscium does not divide by binary fission.Rather,each cell increases in size and divides to produce multiple daughter cells that are held within the original cell well.After lysis,those daughters are released to repeat the process. Assuming Epulopiscium could be grown in pure culture in the laboratory in broth and on solid media (it currently cannot) ,which method would be best for measuring the increase in biomass during growth?

Accepted Answer

A)   The viable plate count; each colony derives from a single cell and the number of colonies equals the number of cells.
B)   Turbidity readings from a spectrophotometer; the increase in biomass will directly vary with the turbidity of the culture.
C)   Chemostat growth; it will prevent the culture from entering the death phase.
D)   Direct microscopic count; the experimenter can directly count the number of cells and extrapolate to the biomass.E) A) and C)
F) A) and B)

Exam 15: Host Defenses II: Specific Immunity and Immunization

The process by which a cell uses ATP to enclose a substance in its membrane,by forming a vacuole and engulfing it,is called ______.

Correct Answer
verified

Anaerobes can be cultured in a CO₂ environment.

Correct Answer
verified

The methanogens,producers of methane gas,require environments that

Correct Answer
verified

An organic nutrient that cannot be synthesized by the organism and must be provided is called a(n) ______.

Correct Answer
verified

A microorganism that has an optimum growth temperature of 37°C,but can survive short exposure to high temperatures is called a(n) ______.

Correct Answer
verified

The toxic superoxide ion is converted to harmless oxygen by two enzymes,

Correct Answer
verified

Most microorganisms can only grow in habitats that are similar to human body conditions.

Correct Answer
verified

In a commensal relationship,the commensal benefits but the cohabitant is neither harmed nor benefited.

Correct Answer
verified

Inorganic nitrogen must be converted to ammonia to be used by a cell.

Correct Answer
verified

A closed culture system is used to determine a population growth curve.

Correct Answer
verified

The movement of substances from higher to lower concentration across a semipermeable membrane via a specific protein carrier but without energy expenditure is called ______.

Correct Answer
verified

Correct Answer
verified

An organism that uses CO₂ for its carbon needs and sunlight for its energy needs would be called a ______.

Correct Answer
verified

In the viable plate count method,a measured volume of a culture is evenly spread across an agar surface and incubated.Each _ represents one _ from the original sample.

Correct Answer
verified

Which compound has the highest concentration in a cell?

Correct Answer
verified

E.coli bacteria normally live in the human gut and produce vitamin K that the body uses.This is best termed a ______ relationship.

Correct Answer
verified

When it is important to count the number of cells,determine cell size,and differentiate between dead and live cells,a(n) ______ is used.

Correct Answer
verified

Exam 15: Host Defenses II: Specific Immunity and Immunization

The process by which a cell uses ATP to enclose a substance in its membrane,by forming a vacuole and engulfing it,is called ______.

Correct AnswerverifiedShow Answer

Anaerobes can be cultured in a CO2 environment.

Correct AnswerverifiedShow Answer

The methanogens,producers of methane gas,require environments that

Correct AnswerverifiedShow Answer

An organic nutrient that cannot be synthesized by the organism and must be provided is called a(n) ______.

Correct AnswerverifiedShow Answer

A microorganism that has an optimum growth temperature of 37°C,but can survive short exposure to high temperatures is called a(n) ______.

Correct AnswerverifiedShow Answer

The toxic superoxide ion is converted to harmless oxygen by two enzymes,

Correct AnswerverifiedShow Answer

Most microorganisms can only grow in habitats that are similar to human body conditions.

Correct AnswerverifiedShow Answer

In a commensal relationship,the commensal benefits but the cohabitant is neither harmed nor benefited.

Correct AnswerverifiedShow Answer

Inorganic nitrogen must be converted to ammonia to be used by a cell.

Correct AnswerverifiedShow Answer

A closed culture system is used to determine a population growth curve.

Correct AnswerverifiedShow Answer

The movement of substances from higher to lower concentration across a semipermeable membrane via a specific protein carrier but without energy expenditure is called ______.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

An organism that uses CO2 for its carbon needs and sunlight for its energy needs would be called a ______.

Correct AnswerverifiedShow Answer

In the viable plate count method,a measured volume of a culture is evenly spread across an agar surface and incubated.Each _____ represents one _____ from the original sample.

Correct AnswerverifiedShow Answer

Which compound has the highest concentration in a cell?

Correct AnswerverifiedShow Answer

E.coli bacteria normally live in the human gut and produce vitamin K that the body uses.This is best termed a ______ relationship.

Correct AnswerverifiedShow Answer

When it is important to count the number of cells,determine cell size,and differentiate between dead and live cells,a(n) ______ is used.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Anaerobes can be cultured in a CO₂ environment.

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

An organism that uses CO₂ for its carbon needs and sunlight for its energy needs would be called a ______.

Correct Answer
verified

In the viable plate count method,a measured volume of a culture is evenly spread across an agar surface and incubated.Each _ represents one _ from the original sample.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified