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A-B Exotoxins (Diphtheria Exotoxin)

View the animation below, then complete the quiz to test your knowledge of the concept.






1In A-B toxins
A)A is the toxic part
B)B is the toxic part
C)both A and B are toxic
D)neither A or B are toxic
E)B is toxic only after A has allowed it to enter the cell



2How does the toxin enter the cell?
A)after B binds to host cell receptors, A enters the host cell alone by endocytosis
B)after B binds to host cell receptors, both A and B enter the host cell by endocytosis
C)after A binds to host cell receptors, A enters the host cell by endocytosis
D)after both A and B bind to host cell receptors, both A and B enter by endocytosis



3After the A-B toxin enters the cell
A)an alkaline pH causes A and B to separate
B)A is removed by exocytosis
C)B is removed by exocytosis
D)B causes toxicity
E)both A and B prevent protein synthesis



4In Corynebacterium diphtheriae, the A toxin produced carries out the transfer of ADP-ribose to elongation factor 2, inhibiting protein synthesis.
A)True
B)False



5All A toxins work the same way.
A)True
B)False







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