For Each of the Following Sentences, Select the Best Word

For each of the following sentences, select the best word or phrase from the list below to fill in the blanks.Not all words or phrases will be used; each word or phrase should be used only once.
$\begin{array}{lll}\text { acetylase } & \text { decouple } & \text { GTP-binding } \\\text { AMP-binding } & \text { decrease } & \text { neurotransmitter } \\\text { amplify } & \text { effector } & \text { protein kinases } \\\text { autocrine } & \text { esterases } & \text { protein phosphatases } \\\text { cleavage } & \text { integrate } & \text { receptors } \\\text { convolute } & \text { GMP-binding } & \text { sterols }\end{array}$

An extracellular signal molecule can act to change a cell's behavior by acting through cell-surface __________ that control intracellular signaling proteins.These intracellular signaling proteins ultimately change the activity of __________ proteins that bring about cell responses.Intracellular signaling proteins can __________ the signal received to evoke a strong response from just a few extracellular signal molecules.A cell that receives more than one extracellular signal at the same time can __________ this information using intracellular signaling proteins.__________ proteins can act as molecular switches, letting a cell know that a signal has been received.Enzymes that phosphorylate proteins, termed __________, can also serve as molecular switches; the actions of these enzymes are countered by the activity of __________.