7.In the figure above, part of the signal transduction mechanism common to G proteln- linked receptors is shown. Of the steps in this pathway, select the step that will occur next. a. Extracellular signal binds to the receptor. b. Signal binding to receptor causes a change in shape in the receptor. c. GTP bound to the G protein is exchanged for GDP. d. Activated G protein subunit binds to effector protein. e. Activated cellular enzymes catalyze the formation of products, effectively amplifying the signal inside the cell.

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Cell Signaling

It allows cells to perform various cellular activities, coordinate, and interact with other cells. All cells of an organism receive signals from their environments and respond accordingly. Even the unicellular eukaryotes receive signals secreted by other cells and respond. In the case of yeast, mating takes place by signaling between the yeast cells. Communication by cell signaling in a multicellular organism has become a vast and important part of various fields of biology.