Question 1

An important mineral ion that is a component of chlorophyll,and stabilizer of membranes and ribosomes is

Accepted Answer

A)  iron.
B)  zinc.
C)  calcium.
D)  magnesium.
E)  potassium.

Question 2

In _____ conditions,the cell wall will help prevent the cell from bursting.

Accepted Answer

A)  hypertonic
B)  hypotonic
C)  isotonic
D)  mesotonic

Question 3

A microorganism that has an optimum growth temperature of 37 ∘\circ∘  C,but can survive short exposure to high temperatures is called a/n

Accepted Answer

A)  extremophile.
B)  thermophile.
C)  psychrophile.
D)  facultative psychrophile.
E)  thermoduric microbe.

Question 4

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

Accepted Answer

A)  electrolytes
B)  macronutrients
C)  water
D)  growth factors
E)  trace elements

Question 5

Which of the following statements is the best explanation of why communities of microorganisms in biofilms are synergistic.

Accepted Answer

A)  The various microbial species in the biofilm interact with each other.
B)  One microbial species may produce a metabolic end product that can be used as a substrate by another species.
C)  The different microbial species can all grow together.
D)  The various microbial species can change the environment to their growth advantage,allowing all to grow better.

Question 6

Most of the dry weight of a microbial cell is from

Accepted Answer

A)  inorganic compounds.
B)  minerals.
C)  water.
D)  organic compounds.
E)  salts.

Question 7

When whole cells or large molecules in solution are engulfed by a cell,this endocytosis is specifically termed

Accepted Answer

A)  pinocytosis.
B)  phagocytosis.
C)  facilitated transport.
D)  facilitated diffusion.
E)  exocytosis. B

Question 8

The direct cell count,using a cytometer,can calculate viable cell numbers from a sample without the use of dyes.

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

A)  heterotroph.
B)  photoautotroph.
C)  chemoheterotroph.
D)  saprobe.
E)  halotroph.

Question 10

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

Accepted Answer

A)  psychrophiles.
B)  anaerobes.
C)  facultative anaerobes.
D)  mesophiles.
E)  capnophiles.

Question 11

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

Accepted Answer

A)  symbiosis.
B)  satellitism.
C)  antibiosis.
D)  mutualism.
E)  synergism.

Question 12

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)  osmosis.
E)  endocytosis.

Question 13

The type of photosynthesis that does not produce oxygen

Accepted Answer

A)  occurs in cyanobacteria.
B)  does not require CO2 as a reactant.
C)  occurs in purple and green sulfur bacteria.
D)  does not require sunlight.
E)  occurs in algae and plants.

Question 14

Calcium is required for bacteria because it

Accepted Answer

A)  stabilizes the cell wall.
B)  stabilizes the ribosomes.
C)  stabilizes the nucleoid.
D)  maintains cellular pH.
E)  makes strong cell walls.

Question 15

A Coulter counter can count viable cells as well as determine the size.

Accepted Answer

A) True 
 B)False

Question 16

Obligate saprobes can adapt to a living host.

Accepted Answer

A) True 
 B)False

Question 17

Nutrient absorption is mediated by the

Accepted Answer

A)  cell wall.
B)  peptidoglycan layer.
C)  proteins in the periplasmic space.
D)  cell membrane.
E)  nuclear membrane. D

Question 18

A loopful of bacteria containing 1000 bacterial cells is inoculated into a nutrient broth and incubated.The culture was in lag phase for 10 minutes and then went into exponential log phase growth for 5 hours.The generation time for the bacterium is 15 minutes.Which equation set up is the correct one to determine how many cells at the end of the 5 hours of log phase growth.

Accepted Answer

A)  1000 X 220
B)  1000 X 40
C)  1000 X 24
D)  1000 X 5 X 2 X 15 A

Question 19

Aerobic respiration is an example of

Accepted Answer

A)  photosynthesis.
B)  methanoheterophy.
C)  photoheterotrophy.
D)  chemoheterotrophy.
E)  photoautotrophy.

Question 20

You want to experiment with microbial growth in various nutrients,so you inoculate a loopful of E.coli into a tube of honey.Which statement best describes what you expect to happen and why?

Accepted Answer

A)  The bacterium grows incredibly well in the honey because fructose is such a great nutrient for bacteria.
B)  The bacteria do not grow because they have been dehydrated by the honey.
C)  The bacteria will not growth because the excessive sugar is directly toxic to the bacteria.
D)  The bacteria do not growth because there is only sugar in the honey,without other nutrients present they cannot survive.

Exam 7: Microbial Nutrition, Ecology, and Growth

An important mineral ion that is a component of chlorophyll,and stabilizer of membranes and ribosomes is

Correct Answer
verified

In _____ conditions,the cell wall will help prevent the cell from bursting.

Correct Answer
verified

A microorganism that has an optimum growth temperature of 37^$\circ$ C,but can survive short exposure to high temperatures is called a/n

Correct Answer
verified

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

Correct Answer
verified

Which of the following statements is the best explanation of why communities of microorganisms in biofilms are synergistic.

Correct Answer
verified

Most of the dry weight of a microbial cell is from

Correct Answer
verified

When whole cells or large molecules in solution are engulfed by a cell,this endocytosis is specifically termed

Correct Answer
verified
B

The direct cell count,using a cytometer,can calculate viable cell numbers from a sample without the use of dyes.

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

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

Correct Answer
verified

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

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

The type of photosynthesis that does not produce oxygen

Correct Answer
verified

Calcium is required for bacteria because it

Correct Answer
verified

A Coulter counter can count viable cells as well as determine the size.

Correct Answer
verified

Obligate saprobes can adapt to a living host.

Correct Answer
verified

Nutrient absorption is mediated by the

Correct Answer
verified
D

Correct Answer
verified
A

Aerobic respiration is an example of

Correct Answer
verified

You want to experiment with microbial growth in various nutrients,so you inoculate a loopful of E.coli into a tube of honey.Which statement best describes what you expect to happen and why?

Correct Answer
verified

Exam 7: Microbial Nutrition, Ecology, and Growth

An important mineral ion that is a component of chlorophyll,and stabilizer of membranes and ribosomes is

Correct AnswerverifiedShow Answer

In _____ conditions,the cell wall will help prevent the cell from bursting.

Correct AnswerverifiedShow Answer

A microorganism that has an optimum growth temperature of 37 ∘\circ∘ C,but can survive short exposure to high temperatures is called a/n

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following statements is the best explanation of why communities of microorganisms in biofilms are synergistic.

Correct AnswerverifiedShow Answer

Most of the dry weight of a microbial cell is from

Correct AnswerverifiedShow Answer

When whole cells or large molecules in solution are engulfed by a cell,this endocytosis is specifically termed

Correct AnswerverifiedB

The direct cell count,using a cytometer,can calculate viable cell numbers from a sample without the use of dyes.

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

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

Correct AnswerverifiedShow Answer

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

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

The type of photosynthesis that does not produce oxygen

Correct AnswerverifiedShow Answer

Calcium is required for bacteria because it

Correct AnswerverifiedShow Answer

A Coulter counter can count viable cells as well as determine the size.

Correct AnswerverifiedShow Answer

Obligate saprobes can adapt to a living host.

Correct AnswerverifiedShow Answer

Nutrient absorption is mediated by the

Correct AnswerverifiedD

Correct AnswerverifiedA

Aerobic respiration is an example of

Correct AnswerverifiedShow Answer

You want to experiment with microbial growth in various nutrients,so you inoculate a loopful of E.coli into a tube of honey.Which statement best describes what you expect to happen and why?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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A microorganism that has an optimum growth temperature of 37^$\circ$ C,but can survive short exposure to high temperatures is called a/n

Correct Answer
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B

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

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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D

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A

Correct Answer
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Correct Answer
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