Answer:
The correct answer is a Receptor ubiquitinylation mechanism is most likely to irreversibly terminate a signal transduction pathway.
Explanation:
Cell signaling or signal trasduction is phenomenon that regulates all physiological and biochemical processes that occur inside our body.Cell signaling take place by the binding of signaling molecule to a specific receptor.
It is also very much important to terminate the signaling pathways after the physiological or biochemical process is completed to maintain body"s normal homeostasis.
Irreversible termination of signal transduction means signaling pathway that is terminated cannot be reversed for further activation. Receptor ubiquitinylation or destruction of receptor by ubiquitin proteins and its associated enzymes helps to irreversibly terminate a signal transduction pathway.