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.

Question

Quizplus · Accepted Answer

The cellular response would be prolonged because a nonhydrolyzable analogue of GTP would prevent the inactivation of G proteins involved in the signaling pathway, similar to how epinephrine works through G protein-coupled receptors. This leads to a continuous activation of the signaling pathway.

To Test Whether the XFF Signal System Is Similar to That