Actin and myosin are proteins that interact to produce movement in muscle cells. would their genes be turned on or off in brain cells? explain

With the word calcite wich completes the analogy mineral, erosion, marble, or aragonite

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The small molecule cyclic amp (camp) takes about 0.2 second to diffuse 10 μm, on average, in a cell. suppose that camp is produced near the plasma membrane on one end of the cell; how long will it take for this camp to diffuse through the cytosol and reach the opposite end of a very large cell, on average? assume that the cell is 200 μm in diameter.