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 D)
G) C) and D)

Question 2

A bacterium is inoculated into a tube of thioglycollate and incubated.After incubation, turbidity appears throughout, top to bottom, with the greatest turbidty at the very top.This bacterium would be called a(n)  ______.

Accepted Answer

A)  microaerophile
B)  psychrotroph
C)  facultative anaerobe
D)  aerotolerant microbe
E)  obligate aerobeF) B) and D)
G) B) and C)

Question 3

Mediated transport of polar molecules and ions across the plasma membrane utilizes a(n)  _____ carrier that binds to the substance and causes a conformational change to allow its movement across the membrane.

Accepted Answer

A)  porin
B)  lipid
C)  protein
D)  enzymeE) None of the above
F) All of the above

Question 4

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) B) and C)

Question 5

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) All of the above
G) A) and E)

Question 6

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) A) and D)
F) All of the above

Question 7

A halophile would grow best in ______.

Accepted Answer

A)  fresh water ponds
B)  hot geyser springs
C)  arid, desert soil
D)  acid pools
E)  salt lakesF) A) and E)
G) A) and D)

Question 8

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) C) and D)
G) A) and C)

Question 9

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) None of the above
G) All of the above

Question 10

The phase of the bacterial growth curve in which the rate of multiplication equals the rate of cell death is the ______.

Accepted Answer

A)  stationary phase
B)  lag phase
C)  death phase
D)  exponential phase
E)  telophaseF) C) and D)
G) A) and C)

Question 11

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) C) and E)
G) C) and D)

Question 12

All of the following could find a location in or on human body tissues suitable for growth except ______.

Accepted Answer

A)  capnophiles
B)  mesophiles
C)  anaerobes
D)  psychrophiles
E)  facultative anaerobesF) None of the above
G) C) and D)

Question 13

Phosphorus is one of the major elements needed in larger quantities by microorganisms.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following is not a major element of a microbial cell?

Accepted Answer

A)  Oxygen
B)  Carbon
C)  Copper
D)  Hydrogen
E)  NitrogenF) A) and D)
G) All of the above

Question 15

A barophile would grow best in ______.

Accepted Answer

A)  acid pools
B)  deep oceans
C)  arid, desert soil
D)  hot geyser springs
E)  salt lakesF) A) and C)
G) A) and B)

Question 16

The biofilm that forms in your shower ("shower curtain scum")  can tolerate exposure to hot water when you shower and is resistant to desiccation between showers.The microbes in the biofilm are not endospores, so what is the best explanation for their survival under these conditions?

Accepted Answer

A)  Bioflms are composed of diverse microbes, and within each biofilm, there are certain to be endospore-formers and thermophiles.
B)  The shower hasn't been thoroughly cleaned in a while, and when I really scrub it, the microbes will all be killed.
C)  Although some microbes will be killed, those embedded deeply within the biofilm are protected from environmental challenges.
D)  Dead skin cells continuously replenish the biofilm, and organic soaps provide a continuous carbon source.E) C) and D)
F) B) and D)

Question 17

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 D)
G) A) and E)

Question 18

Which of the following is not a step in binary fission of bacterial cells?

Accepted Answer

A)  Protein band forms in the center of the cell to mark the division site.
B)  Chromosome is replicated.
C)  Mitotic spindle segregates daughter chromosomes.
D)  Septum formation separates the cytoplasm of the daughter cells.E) A) and B)
F) A) and C)

Question 19

When microbes live independently but cooperate and share nutrients, it is called ______.

Accepted Answer

A)  symbiosis
B)  synergism
C)  mutualism
D)  antibiosisE) A) and C)
F) None of the above

Question 20

Bacteria living in a freshwater stream that are transferred to ocean water would

Accepted Answer

A)  be in an isotonic solution.
B)  gain water.
C)  be in a hypotonic solution.
D)  become dehydrated due to the loss of water.E) None of the above
F) A) and B)

Exam 7: Microbial Nutrition, Ecology, and Growth

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

A bacterium is inoculated into a tube of thioglycollate and incubated.After incubation, turbidity appears throughout, top to bottom, with the greatest turbidty at the very top.This bacterium would be called a(n) ______.

Correct Answer
verified

When microbes live independently but cooperate and share nutrients, it is called ______.

Correct Answer
verified

Mediated transport of polar molecules and ions across the plasma membrane utilizes a(n) _____ carrier that binds to the substance and causes a conformational change to allow its movement across the membrane.

Correct Answer
verified

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

Which of the following is not a step in binary fission of bacterial cells?

Correct Answer
verified

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

A microaerophile

Correct Answer
verified

The phase of the bacterial growth curve in which the rate of multiplication equals the rate of cell death is the ______.

Correct Answer
verified

Phosphorus is one of the major elements needed in larger quantities by microorganisms.

Correct Answer
verified

The biofilm that forms in your shower ("shower curtain scum") can tolerate exposure to hot water when you shower and is resistant to desiccation between showers.The microbes in the biofilm are not endospores, so what is the best explanation for their survival under these conditions?

Correct Answer
verified

The term obligate refers to

Correct Answer
verified

All of the following could find a location in or on human body tissues suitable for growth except ______.

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

Bacteria living in a freshwater stream that are transferred to ocean water would

Correct Answer
verified

Which of the following is not a major element of a microbial cell?

Correct Answer
verified

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

Correct Answer
verified

A barophile would grow best in ______.

Correct Answer
verified

A halophile would grow best in ______.

Correct Answer
verified

Correct Answer
verified

Exam 7: Microbial Nutrition, Ecology, and Growth

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

A bacterium is inoculated into a tube of thioglycollate and incubated.After incubation, turbidity appears throughout, top to bottom, with the greatest turbidty at the very top.This bacterium would be called a(n) ______.

Correct AnswerverifiedShow Answer

When microbes live independently but cooperate and share nutrients, it is called ______.

Correct AnswerverifiedShow Answer

Mediated transport of polar molecules and ions across the plasma membrane utilizes a(n) _____ carrier that binds to the substance and causes a conformational change to allow its movement across the membrane.

Correct AnswerverifiedShow Answer

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

Which of the following is not a step in binary fission of bacterial cells?

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

A microaerophile

Correct AnswerverifiedShow Answer

The phase of the bacterial growth curve in which the rate of multiplication equals the rate of cell death is the ______.

Correct AnswerverifiedShow Answer

Phosphorus is one of the major elements needed in larger quantities by microorganisms.

Correct AnswerverifiedShow Answer

The biofilm that forms in your shower ("shower curtain scum") can tolerate exposure to hot water when you shower and is resistant to desiccation between showers.The microbes in the biofilm are not endospores, so what is the best explanation for their survival under these conditions?

Correct AnswerverifiedShow Answer

The term obligate refers to

Correct AnswerverifiedShow Answer

All of the following could find a location in or on human body tissues suitable for growth except ______.

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

Bacteria living in a freshwater stream that are transferred to ocean water would

Correct AnswerverifiedShow Answer

Which of the following is not a major element of a microbial cell?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A barophile would grow best in ______.

Correct AnswerverifiedShow Answer

A halophile would grow best in ______.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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