Review the animation and answer the questions that follow to test your understanding.

1			In 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
2			How 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
3			After 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
4			In Corynebacterium diphtheriae, the A toxin produced carries out the transfer of ADP-ribose to elongation factor 2, inhibiting protein synthesis.
			A)	True
			B)	False
5			All A toxins work the same way.
			A)	True
			B)	False