The best description of the function of phosphatases in signal transduction is that it
A)moves the phosphate group of the transduction pathway to the next molecule of a series.
B)prevents a protein kinase from being reused when there is another extracellular signal.
C)amplifies the transduction signal so it affects multiple transducers.
D)amplifies the second messengers such as cAMP.
E)inactivates protein kinases and turns off the signal transduction.

Question

Quizplus · Accepted Answer

Phosphatases are enzymes that catalyze the removal of phosphate groups from proteins, and are involved in turning off signals in signal transduction pathways. Inactivation of protein kinases by phosphatases is an important mechanism for terminating the signaling process. Therefore, option E is the best choice.

The Best Description of the Function of Phosphatases in Signal