Which statement is not right about diphtheria bacilli ?
A. It is Gram positive,
B. They contain metachromatic granules ;
C. They are anrranged in Y letter,
D. They have endospore,
Which medium is used for cultivation of C. diphtheria ?
A. Loffler’s medium
Bloody agar plate;
Chocolate plate;
D. TCBS plate;
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;
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;
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