Which statement is right about role of gene transfer in toxin of diphtheria bacilli ?
A. acquired by transformation,
B. acquired by conjugation
C. Acquired by lysogenic conversion;
D. acquired by transduction;
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Which is right about action of diphtheria toxin ?
A. It blocks synthesis of protein via breaking the ribosome,
B. It blocks synthesis of protein via inactivating elongation factor-2;
C. It makes pore on the membrane of cells;
D. It degrades cellular DNA to kill the cells;
Which type of vaccine is used to prevent diphtheria in children?
A. toxoid
B. killed vaccine;
C. attenuated vaccine;
D. capsular polysaccharide;
The action mechanism of `diphtheria toxin is ___:
A. Increase cAMP level;
Break ribosome;
C. inactivate EF-2 to block protein synthesis;
D. Cause damage to ciliated cells of respiratory tract;
Which one of the following statements about diphtheria bacilli is not correct:
All corynebacteria diphtheria can cause disease
B. It has granules on its terminals;
C. It can form black colony in tellurites blood agar plate;
D. Administration of toxoid of diphtheria toxin can prevent disease.
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