Question 1

The ectosymbionts of ruminant animals are useful to their hosts in which of the following ways?

Accepted Answer

A)  They digest the cellulose of plant cell walls.
B)  They produce most of the vitamins needed by the ruminant.
C)  They convert glucose to organic acids.
D)  All of the choices are correct.E) C) and D)
F) B) and D)

Question 2

The filamentous bacteria that grow on the dorsal surface of certain polychaete worms

Accepted Answer

A)  fend off potential predators with toxins.
B)  carry out photosythesis.
C)  may provide the worm with protection from toxic metals.
D)  All of the choices are correct.E) None of the above
F) A) and D)

Question 3

A species of bacterium associated with the oil glands of the skin belongs to the genus

Accepted Answer

A)  Staphylococcus.
B)  Pityrosporum.
C)  Propionibacterium.
D)  PityrosporumE) A) and D)
F) B) and D)

Question 4

The lower respiratory tract has a normal microbiota.

Accepted Answer

A) True 
 B)False

Question 5

A _________ is any disease-producing microorganism.

Accepted Answer

The answer of A _________ is any disease-producing microorganism....

Question 6

In the host-parasite relationship,it is advantageous for the parasite to disable and kill its host as quickly as possible.

Accepted Answer

A) True 
 B)False

Question 7

An example of microbial ___________ is the ability of Vampirococcus to attach to the outer membrane of its prey and then secrete degradative enzymes that result in the release of the prey's cytoplasmic contents.

Accepted Answer

The answer of An example of microbial ___________ is the...

Question 8

Several cases of an emerging infectious disease are reported in workers at a research station that borders a tropical rainforest region.The pathogen is identified as a species of bacteria carried by nematodes that infect mosquitos,and disease transmission occurs in a human host following a mosquito bite.Which organisms should be targeted in the treatment of infected patients?

Accepted Answer

A)  Mosquito,nematode,and bacteria
B)  Mosquito and nematode
C)  Nematode and bacteria
D)  Mosquito and bacteriaE) None of the above
F) A) and B)

Question 9

Which of the following areas of the human body is(are) not normally free of microorganisms?

Accepted Answer

A)  Respiratory tract
B)  Intestinal tract
C)  Eyes
D)  All of the choices are correct.E) A) and B)
F) B) and C)

Question 10

Pseudonocardia is an organism that is hosted by

Accepted Answer

A)  wood-eating insects.
B)  marine invertebrates.
C)  ants that cultivate fungal gardens.
D)  people with severe acne.E) C) and D)
F) None of the above

Question 11

Which of the following processes is not one that is common to all symbionts?

Accepted Answer

A)  Predation
B)  Colonization
C)  Reproduction
D)  PersistenceE) B) and C)
F) C) and D)

Question 12

Gram-positive bacteria such as Propionibacterium acnes limit the growth of gram-negative bacteria and some fungi on the human skin by converting secreted __________ to compounds with antimicrobial activity.

Accepted Answer

A)  lipids
B)  organic acids
C)  salts
D)  ureaE) All of the above
F) None of the above

Question 13

Any microorganism that spends a portion of its life associated with another organism of a different species is engaged in

Accepted Answer

A)  symbiosis.
B)  synergy.
C)  parasitism.
D)  commensalism.E) All of the above
F) A) and B)

Question 14

Microbes such as Lactobacillus acidophilus colonize the human vagina by fermenting .

Accepted Answer

A)  glycogen
B)  glucose
C)  lactose
D)  sucroseE) All of the above
F) B) and C)

Question 15

Coral bleaching where the photosynthetic endosymbiont is lost or becomes non-functional can be caused by temperature increases as small as 2oC.

Accepted Answer

A) True 
 B)False

Question 16

The oral cavity of humans normally becomes colonized with microorganisms within hours after birth.

Accepted Answer

A) True 
 B)False

Question 17

A researcher proposes that the relationship between a particular bacterial species that produces a fat-soluble vitamin is mutualistic with its insect host.Which of the following procedures would best test the researcher's hypothesis?

Accepted Answer

A)  Determine which antibiotic kills the bacteria without harming the host,then administer this antibiotic to the insect and compare its growth with and without the vitamin
B)  Determine which insecticide kills the insect without harming the bacterial host,then compare vitamin production by the bacteria from insects treated with the insecticide to those from untreated insects
C)  Design a method to isolate the bacteria from the insect,then mutate the bacteria in the region of DNA that controls vitamin production and compare growth of the mutant and wild-type bacteria on minimal media
D)  Extract the DNA from the bacteria and from the insect,then use reverse-transcriptase PCR and primers specific to the gene that controls vitamin synthesis to compare transcription of RNA in both organismsE) All of the above
F) C) and D)

Question 18

In a lichen,the fungal partner

Accepted Answer

A)  protects the alga from excess light intensities.
B)  provides water and minerals to the alga.
C)  provides a substratum within which the alga grows.
D)  All of the choices are correct.E) C) and D)
F) B) and D)

Question 19

From which body region would you expect to isolate Clostridium,Bacteroides,Fusobacterium and other anaerobic genera?

Accepted Answer

A)  Large intestine
B)  Skin
C)  Nasopharynx
D)  StomachE) B) and D)
F) A) and D)

Question 20

In commensalism

Accepted Answer

A)  the host and commensal can be separated and remain viable.
B)  the commensal is metabolically dependent on the host.
C)  the host provides some factor that the commensal cannot get otherwise.
D)  the host and commensal cannot be separated and remain viable and the commensal is metabolically dependent on the host.E) A) and B)
F) C) and D)

Exam 32: Microbial Interactions

An example of microbial ___________ is the ability of Vampirococcus to attach to the outer membrane of its prey and then secrete degradative enzymes that result in the release of the prey's cytoplasmic contents.

Correct Answer
verified

Coral bleaching where the photosynthetic endosymbiont is lost or becomes non-functional can be caused by temperature increases as small as 2^oC.

Correct Answer
verified

Which of the following areas of the human body is(are) not normally free of microorganisms?

Correct Answer
verified

The ectosymbionts of ruminant animals are useful to their hosts in which of the following ways?

Correct Answer
verified

Correct Answer
verified

In commensalism

Correct Answer
verified

In the host-parasite relationship,it is advantageous for the parasite to disable and kill its host as quickly as possible.

Correct Answer
verified

Which of the following processes is not one that is common to all symbionts?

Correct Answer
verified

In a lichen,the fungal partner

Correct Answer
verified

Any microorganism that spends a portion of its life associated with another organism of a different species is engaged in

Correct Answer
verified

Gram-positive bacteria such as Propionibacterium acnes limit the growth of gram-negative bacteria and some fungi on the human skin by converting secreted __________ to compounds with antimicrobial activity.

Correct Answer
verified

A species of bacterium associated with the oil glands of the skin belongs to the genus

Correct Answer
verified

Pseudonocardia is an organism that is hosted by

Correct Answer
verified

A researcher proposes that the relationship between a particular bacterial species that produces a fat-soluble vitamin is mutualistic with its insect host.Which of the following procedures would best test the researcher's hypothesis?

Correct Answer
verified

The oral cavity of humans normally becomes colonized with microorganisms within hours after birth.

Correct Answer
verified

The lower respiratory tract has a normal microbiota.

Correct Answer
verified

A _________ is any disease-producing microorganism.

Correct Answer
verified

Microbes such as Lactobacillus acidophilus colonize the human vagina by fermenting .

Correct Answer
verified

From which body region would you expect to isolate Clostridium,Bacteroides,Fusobacterium and other anaerobic genera?

Correct Answer
verified

The filamentous bacteria that grow on the dorsal surface of certain polychaete worms

Correct Answer
verified

Exam 32: Microbial Interactions

An example of microbial ___________ is the ability of Vampirococcus to attach to the outer membrane of its prey and then secrete degradative enzymes that result in the release of the prey's cytoplasmic contents.

Correct AnswerverifiedShow Answer

Coral bleaching where the photosynthetic endosymbiont is lost or becomes non-functional can be caused by temperature increases as small as 2oC.

Correct AnswerverifiedShow Answer

Which of the following areas of the human body is(are) not normally free of microorganisms?

Correct AnswerverifiedShow Answer

The ectosymbionts of ruminant animals are useful to their hosts in which of the following ways?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In commensalism

Correct AnswerverifiedShow Answer

In the host-parasite relationship,it is advantageous for the parasite to disable and kill its host as quickly as possible.

Correct AnswerverifiedShow Answer

Which of the following processes is not one that is common to all symbionts?

Correct AnswerverifiedShow Answer

In a lichen,the fungal partner

Correct AnswerverifiedShow Answer

Any microorganism that spends a portion of its life associated with another organism of a different species is engaged in

Correct AnswerverifiedShow Answer

Gram-positive bacteria such as Propionibacterium acnes limit the growth of gram-negative bacteria and some fungi on the human skin by converting secreted __________ to compounds with antimicrobial activity.

Correct AnswerverifiedShow Answer

A species of bacterium associated with the oil glands of the skin belongs to the genus

Correct AnswerverifiedShow Answer

Pseudonocardia is an organism that is hosted by

Correct AnswerverifiedShow Answer

A researcher proposes that the relationship between a particular bacterial species that produces a fat-soluble vitamin is mutualistic with its insect host.Which of the following procedures would best test the researcher's hypothesis?

Correct AnswerverifiedShow Answer

The oral cavity of humans normally becomes colonized with microorganisms within hours after birth.

Correct AnswerverifiedShow Answer

The lower respiratory tract has a normal microbiota.

Correct AnswerverifiedShow Answer

A _________ is any disease-producing microorganism.

Correct AnswerverifiedShow Answer

Microbes such as Lactobacillus acidophilus colonize the human vagina by fermenting .

Correct AnswerverifiedShow Answer

From which body region would you expect to isolate Clostridium,Bacteroides,Fusobacterium and other anaerobic genera?

Correct AnswerverifiedShow Answer

The filamentous bacteria that grow on the dorsal surface of certain polychaete worms

Correct AnswerverifiedShow Answer

Correct Answer
verified

Coral bleaching where the photosynthetic endosymbiont is lost or becomes non-functional can be caused by temperature increases as small as 2^oC.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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