A cellular response to a signal can be terminated by:
A)depletion of the signal that activates the receptor.
B)inactivation of intracellular signal transduction proteins.
C)inactivation of proteins in the signal pathway over time.
D)depletion of a second messenger.
E)All of these choices are correct.

Question

Quizplus · Accepted Answer

All of the given options can contribute to the termination of a cellular response. Once the signal that activates the receptor is depleted, the receptor will no longer be activated, thus stopping the signal pathway. Similarly, if intracellular signal transduction proteins are inactivated, the signal will not be transduced further down the pathway. Proteins in the pathway could also be inactivated over time, for example through degradation or modification, which would also halt the response. Finally, if a second messenger is depleted, this could prevent downstream effects that depend on the second messenger. Therefore, any of these factors or combinations of them can contribute to the termination of a cellular response to a signal.

A Cellular Response to a Signal Can Be Terminated By