Put the steps of the process of signal transduction in the order they occur (hint - try to decide which signaling pathway this is before working on the order): 1. A conformational change in the signal-receptor complex activates an enzyme. 2. Protein kinases are activated. 3. A signal molecule binds to a receptor. 4. Target proteins are phosphorylated. 5. Second messenger molecules are released. O 1, 2, 3, 4, 5 O 3, 1, 2, 4, 5 O 1, 2, 5, 3, 4 O 3, 1, 5, 2, 4 I

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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.