BIOL 1201 : Biology Final Exam Material
Document Summary
Cell signaling: one cell directly contacting the other, plasmodesmata or gap junctions, local signaling, one cell signaling cells in the adjacent area, this goes under two names, paracrine, synaptic signals, distant (signaling at a distance, involves hormonal signals. The signal molecule leptin is 16,000 da protein. Assuming there are 100 different cell signaling compounds in your body. 100 because need to sense each signal molecule individually. The g-protein binds to that activated receptor and add. Gtp to it, and this activates the g-protein molecule. Protein molecule binds to an inactive enzyme and activates it, and that creates some sort of cellular response. Then, the system just automatically shuts itself down: tyrosine kinase, tyrosine kinase is a large protein with a series of tyrosine residues on it, and it is separated in two parts. Each of these parts must bind a signal molecule. When each of them has bound a signal molecule, they come together and form a dimer structure (activated).
