Use the SGF-signaling pathway image as a reference, to answer the following questions. Use the data provided to EXPLAIN if the cell will get to the response step or not. Keep in mind the purpose of this pathway is to cause skin cell division Growth Factor (GF-signal) Activation of GF Receptor (RTK-receptor) To cause Cell proliferation/cell division (Response) Plasma membrane Pa GEF) MAPX MAPK MAPK You have a skin cell that inject SGF protein directly into the cytoplasm but you do NOT put SGF in the media (the liquid the cell needs to live).

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A:

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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.