A Bacterium Releases a Toxin That Binds to and Activates

question 79

Multiple Choice

A bacterium releases a toxin that binds to and activates a G protein-coupled receptor in the mammalian gut. The result is high levels of cAMP in these cells. This toxin might work by:

• A)binding to and activating the G protein-coupled receptor in these cells.
• B)binding to and inhibiting the G protein-coupled receptor in these cells.
• C)causing the  subunit of the G protein to stay associated with the  and  subunits.
• D)causing the  subunit of the G protein to bind GDP constantly.
• E)causing adenylyl cyclase to dissociate from the membrane.

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