Question 1

Lithoautotrophs use inorganic nutrients for carbon and energy sources.

Accepted Answer

A) True 
 B)False  True

Question 2

After using jelly on a sandwich,you close the jar and place it on a room temperature shelf instead of in the refrigerator.When you open the jar several weeks later,you notice microbial growth on the surface.What type of organism is likely to grow in this environment?

Accepted Answer

A)   Bacteria
B)   Virus
C)   Protozoa
D)   FungusE) None of the above
F) C) and D)

Question 3

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) None of the above

Question 4

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

Question 5

When microbes are in a close nutritional relationship and one benefits but the other is not harmed,it is called ______.

Accepted Answer

A)   mutualism
B)   commensalism
C)   synergism
D)   symbiosisE) B) and C)
F) None of the above

Question 6

Contractile vacuoles are

Accepted Answer

A)   used to expel excess water from cells.
B)   found in bacterial cells.
C)   important to certain organisms in hypertonic environments.
D)   protein carriers in cell membranes.
E)   used to bring solutes into a cell.F) B) and D)
G) A) and C)

Question 7

Which of the following require the cell to use energy?

Accepted Answer

A)   Osmosis
B)   Diffusion
C)   Facilitated diffusion
D)   EndocytosisE) C) and D)
F) B) and D)

Question 8

Facilitated diffusion and active transport require a carrier protein to mediate the movement across the plasma membrane.

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

A)   symbiosis
B)   synergism
C)   mutualism
D)   antibiosisE) B) and C)
F) A) and D)

Question 10

This microbe is photosynthetic,but in the absence of light it can use organic compounds as an energy source.Its carbon source is an organic compound.The appropriate classification for this organism would be ______.

Accepted Answer

A)   chemoautotroph
B)   lithotroph
C)   photoautotroph
D)   photoheterotrophE) A) and D)
F) None of the above

Question 11

Saprobes do not need a carbon source for growth and metabolism.

Accepted Answer

A) True 
 B)False

Question 12

In a close relationship,a change in one partner that results from a change in the other partner is termed ______.

Accepted Answer

A)   mutualism
B)   symbiosis
C)   synergism
D)   coevolution
E)   antibiosisF) A) and B)
G) B) and E) D

Question 13

An organism that cannot tolerate an oxygen environment is a(n) ______.

Accepted Answer

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

Question 14

Obligate saprobes can adapt to a living host.

Accepted Answer

A) True 
 B)False

Question 15

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

Accepted Answer

A) True 
 B)False  True

Question 16

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) All of the above
F) B) and C)

Question 17

The term facultative refers to

Accepted Answer

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

Question 18

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

Question 19

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) A) and C)

Question 20

Calcium is required for bacteria because it

Accepted Answer

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

Exam 15: Host Defenses II: Specific Immunity and Immunization

Lithoautotrophs use inorganic nutrients for carbon and energy sources.

Correct AnswerverifiedTrue

After using jelly on a sandwich,you close the jar and place it on a room temperature shelf instead of in the refrigerator.When you open the jar several weeks later,you notice microbial growth on the surface.What type of organism is likely to grow in this environment?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Growth factors

Correct AnswerverifiedShow Answer

When microbes are in a close nutritional relationship and one benefits but the other is not harmed,it is called ______.

Correct AnswerverifiedShow Answer

Contractile vacuoles are

Correct AnswerverifiedShow Answer

Which of the following require the cell to use energy?

Correct AnswerverifiedShow Answer

Facilitated diffusion and active transport require a carrier protein to mediate the movement across the plasma membrane.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

This microbe is photosynthetic,but in the absence of light it can use organic compounds as an energy source.Its carbon source is an organic compound.The appropriate classification for this organism would be ______.

Correct AnswerverifiedShow Answer

Saprobes do not need a carbon source for growth and metabolism.

Correct AnswerverifiedShow Answer

In a close relationship,a change in one partner that results from a change in the other partner is termed ______.

Correct AnswerverifiedD

An organism that cannot tolerate an oxygen environment is a(n) ______.

Correct AnswerverifiedShow Answer

Obligate saprobes can adapt to a living host.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedTrue

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

The term facultative refers to

Correct AnswerverifiedShow Answer

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

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

Calcium is required for bacteria because it

Correct AnswerverifiedShow Answer

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