Question 1

Which compound has the highest concentration in a cell?

Accepted Answer

A)   NH?
B)   CH?
C)   H?O
D)   CO?
E)   GlucoseF) A) and E)
G) A) and B)

Question 2

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/an ______.

Accepted Answer

A)   anaerobe
B)   microaerophile
C)   facultative anaerobe
D)   capnophile
E)   obligate aerobeF) D) and E)
G) All of the above

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

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

Accepted Answer

A)   carbon dioxide
B)   high salt
C)   high acidity
D)   oxygen
E)   temperatures above 37° CF) All of the above
G) B) and D)

Question 5

The phase of the bacterial growth curve in which newly inoculated cells are adjusting to their new environment, metabolizing but not growing at an exponential rate, is the ______.

Accepted Answer

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

Question 6

Diffusion of water through a semipermeable membrane is called ______.

Accepted Answer

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

Question 7

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

Accepted Answer

A)   magnesium
B)   calcium
C)   potassium
D)   zinc
E)   ironF) All of the above
G) C) and E)

Question 8

An organism that grows slowly in the cold but has an optimum growth temperature of 30°C is called a/an ______.

Accepted Answer

A)   thermoduric microbe
B)   extremophile
C)   psychrophile
D)   psychrotolerant microbe
E)   thermophileF) B) and C)
G) All of the above

Question 9

The term obligate refers to _______.

Accepted Answer

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

Question 10

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

Question 11

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

Question 12

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

Accepted Answer

A)   inorganic compounds
B)   water
C)   organic compounds
D)   salts
E)   mineralsF) A) and E)
G) A) and D)

Question 13

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

Accepted Answer

A)   methylene indicator dye
B)   Coulter counter
C)   ﬂow cytometer
D)   SEM
E)   spectrophotometerF) C) and D)
G) A) and E)

Question 14

The production of antibiotics is a form of antagonism called ______.

Accepted Answer

A)   synergism
B)   symbiosis
C)   antibiosis
D)   mutualismE) None of the above
F) A) and B) C

Question 15

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

Accepted Answer

A)   protein
B)   enzyme
C)   porin
D)   lipidE) A) and C)
F) None of the above

Question 16

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

Accepted Answer

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

Question 17

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

Accepted Answer

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

Question 18

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 oil-degrading microbes used oil (hydrocarbons)  as their carbon source.
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 concentration of sulfate in the Gulf of Mexico is su?cient for the growth of oil- degrading microbes.E) A) and D)
F) C) and D) B

Question 19

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

Accepted Answer

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

Question 20

The degree of turbidity in a broth culture correlates to the amount of cell growth.

Accepted Answer

A) True 
 B)False

Exam 7: Microbial Nutrition and Growth

Which compound has the highest concentration in a cell?

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/an ______.

Correct Answer
verified

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

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

The phase of the bacterial growth curve in which newly inoculated cells are adjusting to their new environment, metabolizing but not growing at an exponential rate, is the ______.

Correct Answer
verified

Diffusion of water through a semipermeable membrane is called ______.

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

An organism that grows slowly in the cold but has an optimum growth temperature of 30°C is called a/an ______.

Correct Answer
verified

The term obligate refers to _______.

Correct Answer
verified

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
D

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

Correct Answer
verified

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

Correct Answer
verified

The production of antibiotics is a form of antagonism called ______.

Correct Answer
verified
C

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

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/an ______.

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified
B

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

Correct Answer
verified

The degree of turbidity in a broth culture correlates to the amount of cell growth.

Correct Answer
verified

Exam 7: Microbial Nutrition and Growth

Which compound has the highest concentration in a cell?

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/an ______.

Correct AnswerverifiedShow Answer

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

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

The phase of the bacterial growth curve in which newly inoculated cells are adjusting to their new environment, metabolizing but not growing at an exponential rate, is the ______.

Correct AnswerverifiedShow Answer

Diffusion of water through a semipermeable membrane is called ______.

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 grows slowly in the cold but has an optimum growth temperature of 30°C is called a/an ______.

Correct AnswerverifiedShow Answer

The term obligate refers to _______.

Correct AnswerverifiedShow Answer

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 AnswerverifiedD

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The production of antibiotics is a form of antagonism called ______.

Correct AnswerverifiedC

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

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/an ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedB

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

Correct AnswerverifiedShow Answer

The degree of turbidity in a broth culture correlates to the amount of cell growth.

Correct AnswerverifiedShow Answer

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
D

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
B

Correct Answer
verified

Correct Answer
verified