Question

question 3 (mandatory) (1.25 points) the termination of a signal is as crucial as its initiation. which of the following mechanisms is essential for stopping a cellular response? receptors become permanently bound to their ligands. second messengers, like camp, are continuously produced. the binding affinity of a ligand for its receptor significantly increases. phosphatases remove phosphate groups from activated proteins.

Explanation:

To stop a cellular response, phosphatases remove phosphate groups from activated proteins, reversing their activation. Receptors don't stay bound (wrong), second messengers aren't continuously produced (wrong), and increased ligand - receptor affinity would prolong the response (wrong). So the correct mechanism is phosphatases acting on activated proteins.

Answer:

Phosphatases remove phosphate groups from activated proteins.