题目内容

Which of the following is false concerning microbial contaminants?

A. Contaminants may become opportunistic pathogens.
B. Most microbial contaminants will eventually cause harm.
Contaminants may be a part of the transient microbiota.
D. Contaminants may be introduced by a mosquito bite.

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The process by which microorganisms attach themselves to hostcells is _____________.

A. Infection
B. contamination
C. disease
D. adhesion

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In which type of symbiosis do both members benefit from theirinteraction?

A. Mutualism
B. parasitism
C. commensalism
D. all above.

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When pathogenic bacteria lose the ability to make adhesins owing to insertion of Tn5 into the gene of pili, they typically ________________.

A. become avirulent
B. produce modified enzyme to break kanamycine
C. Produce endotoxin
D. decrease in virulence

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Which statement about normal flora are right __________.

A. Inhibit R plasmid spread among different bacteria species.
B. Activate immune cells;
C. Antagonism against foreign bacteria;
D. Provide Vit.K to the host;

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Which of the following is false concerning microbial contaminants?

A. Contaminants may become opportunistic pathogens. B. Most microbial contaminants will eventually cause harm. Contaminants may be a part of the transient microbiota. D. Contaminants may be introduced by a mosquito bite.

The process by which microorganisms attach themselves to hostcells is _____________.

In which type of symbiosis do both members benefit from theirinteraction?

When pathogenic bacteria lose the ability to make adhesins owing to insertion of Tn5 into the gene of pili, they typically ________________.

Which statement about normal flora are right __________.

A. Contaminants may become opportunistic pathogens.
B. Most microbial contaminants will eventually cause harm.
Contaminants may be a part of the transient microbiota.
D. Contaminants may be introduced by a mosquito bite.