4. Which of the following is true in cancer cells? Option 1 They do not exhibit density-dependent inhibition when growing in culture,
Option 2 When they stop dividing, they do so at random points in the cell cycle,
Option 3 They are not subject to cell cycle controls
Option 4 They disregard "Checkpoints"
Option 5 All of the above.

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.