题目内容

港澳回归后，由于它们实行高度自治政策，不得纳入国家治理体系。

A. 对
B. 错

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Certain microorganisms are never considered to be members of the normal flora. They are always considered to be pathogens. Which one of the following organisms fits into that category?

A. Streptococcus pneumoniae
B. Escherichia coli
C. Mycobacterium tuberculosis
D. Staphylococcus aureus
E. Neisseria meningitides

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Structure and substances that may enhance the virulence or invasiveness of a bacterium include

A. the capsule
B. hyaluronidase
C. M protein
D. coagulase
E. all of the above

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Which statement is true about an exotoxin?

A. It is commonly produced by gram negative bacteria
B. Its 50% lethal dose may be as low as the picogram level
C. It is composed primarily of carbohydrate
D. It is LPS associated
E. It is heat stable

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Biological products commonly used for passive immunity are

A. killed bacterial cells
B. the vaccine
C. BCG
D. toxoid
E. antitoxin

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港澳回归后，由于它们实行高度自治政策，不得纳入国家治理体系。

A. 对 B. 错

Certain microorganisms are never considered to be members of the normal flora. They are always considered to be pathogens. Which one of the following organisms fits into that category?

Structure and substances that may enhance the virulence or invasiveness of a bacterium include

Which statement is true about an exotoxin?

Biological products commonly used for passive immunity are

A. 对
B. 错