Question 1

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) C) and E)

Question 2

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

Question 3

A microorganism that does not have catalase or superoxide dismutase would find it difficult to live in an environment with ______.

Accepted Answer

A)  temperatures above 37° C
B)  high salt
C)  carbon dioxide
D)  oxygen
E)  high acidityF) A) and B)
G) A) and E)

Question 4

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) A) and B)
G) A) and C)

Question 5

You have inoculated a Clostridium species into a tube of media.After incubation, you observe that there is no growth, and you remember that Clostridium is an obligate anaerobe.What is the best explanation for the observed lack of growth?

Accepted Answer

A)  There is not enough water in the environment for Clostridium to grow.
B)  There is not enough oxygen for use when toxic oxygen is present.
C)  Oxygen in the medium destroys the enzymes needed by Clostridium to undergo aerobic respiration.
D)  Clostridium does not have enzymes to process toxic oxygen.E) A) and B)
F) B) and D)

Question 6

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) C) and E)

Question 7

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 B)
G) B) and D)

Question 8

An organism that can exist in both oxygen and oxygen-free environments is a(n)  ______.

Accepted Answer

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

Question 9

Organisms that feed on dead organisms for nutrients are called ______.

Accepted Answer

A)  lithoautotrophs
B)  parasites
C)  autotrophs
D)  saprobes
E)  phototrophsF) A) and C)
G) B) and E)

Question 10

Microorganisms that live in severe habitats, such as very hot, acidic, or salty environments, are called ______.

Accepted Answer

A)  halophiles
B)  thermophiles
C)  psychrophiles
D)  barophiles
E)  extremophilesF) C) and E)
G) A) and D)

Question 11

Diffusion of water through a semipermeable membrane is called ______.

Accepted Answer

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

Question 12

Whether an organism is an autotroph or heterotroph depends on its source of nitrogen.

Accepted Answer

A) True 
 B)False

Question 13

The movement of molecules from an area of high concentration to an area of lower concentration is called ______.

Accepted Answer

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

Question 14

Microorganisms require large quantities of ______ for use in cell structure and metabolism.

Accepted Answer

A)  water
B)  growth factors
C)  macronutrients
D)  trace elements
E)  electrolytesF) B) and E)
G) None of the above

Question 15

Which of the following properties is likely to be found in a pioneer colonizer of a biofilm on an artificial joint implant?

Accepted Answer

A)  The ability to grow at thermophilic body temperature,(37 º
C)  
B)  Surface structures for attaching to tissue
C)  The ability to use the titanium from the implant as an energy source
D)  No susceptibility to reactive oxygen species like peroxidesE) None of the above
F) B) and C)

Question 16

Growth factors

Accepted Answer

A)  are inorganic.
B)  are synthesized by the organism.
C)  contain elemental oxygen.
D)  cannot be synthesized by the organism.
E)  All of the choices are correct.F) A) and C)
G) A) and E)

Exam 7: Microbial Nutrition, Ecology, and Growth

Organisms that feed on dead organisms for nutrients are called ______.

Correct Answer
verified

Growth factors

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

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

Correct Answer
verified

Which of the following properties is likely to be found in a pioneer colonizer of a biofilm on an artificial joint implant?

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

Microorganisms that live in severe habitats, such as very hot, acidic, or salty environments, are called ______.

Correct Answer
verified

The movement of molecules from an area of high concentration to an area of lower concentration is called ______.

Correct Answer
verified

An organism that can exist in both oxygen and oxygen-free environments is a(n) ______.

Correct Answer
verified

Diffusion of water through a semipermeable membrane is called ______.

Correct Answer
verified

The methanogens, producers of methane gas, require environments that

Correct Answer
verified

You have inoculated a Clostridium species into a tube of media.After incubation, you observe that there is no growth, and you remember that Clostridium is an obligate anaerobe.What is the best explanation for the observed lack of growth?

Correct Answer
verified

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

Correct Answer
verified

Microorganisms require large quantities of ______ for use in cell structure and metabolism.

Correct Answer
verified

A microorganism that does not have catalase or superoxide dismutase would find it difficult to live in an environment with ______.

Correct Answer
verified

Whether an organism is an autotroph or heterotroph depends on its source of nitrogen.

Correct Answer
verified

Exam 7: Microbial Nutrition, Ecology, and Growth

Organisms that feed on dead organisms for nutrients are called ______.

Correct AnswerverifiedShow Answer

Growth factors

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

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

Correct AnswerverifiedShow Answer

Which of the following properties is likely to be found in a pioneer colonizer of a biofilm on an artificial joint implant?

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

Microorganisms that live in severe habitats, such as very hot, acidic, or salty environments, are called ______.

Correct AnswerverifiedShow Answer

The movement of molecules from an area of high concentration to an area of lower concentration is called ______.

Correct AnswerverifiedShow Answer

An organism that can exist in both oxygen and oxygen-free environments is a(n) ______.

Correct AnswerverifiedShow Answer

Diffusion of water through a semipermeable membrane is called ______.

Correct AnswerverifiedShow Answer

The methanogens, producers of methane gas, require environments that

Correct AnswerverifiedShow Answer

You have inoculated a Clostridium species into a tube of media.After incubation, you observe that there is no growth, and you remember that Clostridium is an obligate anaerobe.What is the best explanation for the observed lack of growth?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Microorganisms require large quantities of ______ for use in cell structure and metabolism.

Correct AnswerverifiedShow Answer

A microorganism that does not have catalase or superoxide dismutase would find it difficult to live in an environment with ______.

Correct AnswerverifiedShow Answer

Whether an organism is an autotroph or heterotroph depends on its source of nitrogen.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified