To Test Whether the XFF Signal System Is Similar to That

Multiple Choice

To test whether the XFF signal system is similar to that of epinephrine,you microinject a nonhydrolyzable analogue of GTP into an XFF-responsive cell.If the XFF mechanism is similar to that of epinephrine,you would expect the cellular response to be

A) blocked completely.
B) prolonged.
C) delayed.
D) 50 percent of normal.
E) It is not possible to predict without knowing how many receptors are present on the cell.