Question 1

Which of the following microorganisms would find hypotonic conditions most damaging?

Accepted Answer

A)   Bacteria
B)   Protozoa
C)   Algae
D)   Cyanobacteria
E)   FungiF) A) and D)
G) A) and B)

Question 2

The cell wall will help prevent the cell from bursting in ______ conditions.

Accepted Answer

A)   hypotonic
B)   mesotonic
C)   hypertonic
D)   isotonicE) B) and C)
F) A) and B)

Question 3

The time interval from parent cell to two new daughter cells is called ______.

Accepted Answer

A)   the generation time
B)   the lag time
C)   the culture time
D)   binary fission
E)   the death phaseF) C) and D)
G) A) and B)

Question 4

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

Accepted Answer

A)   symbiosis
B)   synergism
C)   antibiosis
D)   mutualismE) C) and D)
F) B) and D)

Question 5

An organism that grows slowly in the cold but has an optimum growth temperature of 32°C is called a(n)  ______.

Accepted Answer

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

Question 6

Termites are insects that require the protozoan Trichonympha in their gut to synthesize the enzyme cellulase to degrade the cellulose in wood.The protozoan uses the end products of the cellulose breakdown (glucose) .This is a(n) ______ relationship.

Accepted Answer

A)   antagonistic
B)   mutualistic
C)   parasitic
D)   commensualisticE) C) and D)
F) B) and D)

Question 7

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

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

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) B) and C)
G) C) and E)

Question 10

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 B)
G) B) and D)

Question 11

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) A) and C)
G) C) and E)

Question 12

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

Question 13

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)  E.coli does not grow because it has been dehydrated by the honey.
B)  E.coli will not grow because the excessive sugar is toxic.
C)  E.coli grows well in the honey because fructose is a good carbon source.
D)  E.coli do not grow because there is only sugar in the honey and no other nutrients.E) A) and D)
F) None of the above

Question 14

An organism with a temperature growth range of 45°C to 60°C would be called a(n) ______.

Accepted Answer

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

Question 15

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

Accepted Answer

A)   facilitated diffusion
B)   pinocytosis
C)   facilitated transport
D)   phagocytosis
E)   exocytosisF) C) and D)
G) All of the above

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) A) and B)
F) A) and C)

Question 17

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) A) and E)

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

Organisms called _____ live on or in the body of a host and cause some degree of harm.

Accepted Answer

A)   aerobes
B)   pathogens
C)   commensals
D)   mesophiles
E)   halophilesF) B) and D)
G) D) and E)

Question 20

Nutrient absorption is mediated by the ______.

Accepted Answer

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

Exam 15: Host Defenses II: Specific Immunity and Immunization

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

Diffusion of water through a semipermeable membrane is called ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The cell wall will help prevent the cell from bursting in ______ conditions.

Correct AnswerverifiedShow Answer

An organism with a temperature growth range of 45°C to 60°C would be called a(n) ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Termites are insects that require the protozoan Trichonympha in their gut to synthesize the enzyme cellulase to degrade the cellulose in wood.The protozoan uses the end products of the cellulose breakdown (glucose) .This is a(n) ______ relationship.

Correct AnswerverifiedShow Answer

Nutrient absorption is mediated by the ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The movement of molecules from an area of high concentration to an area of lower concentration 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

An organism that grows slowly in the cold but has an optimum growth temperature of 32°C is called a(n) ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The time interval from parent cell to two new daughter cells is called ______.

Correct AnswerverifiedShow Answer

A barophile would grow best in ______.

Correct AnswerverifiedShow Answer

Which of the following microorganisms would find hypotonic conditions most damaging?

Correct AnswerverifiedShow Answer

Organisms called _____ live on or in the body of a host and cause some degree of harm.

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

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

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