A ribosome is measured to have a diffusion coefficient of 2.0 x 10^-8 m^2/s within a mammalian cell. How long would it take for a ribosome to diffuse an rms distance of 9.0 µm, equivalent to the length of a mammalian cell?
1.0 milliseconds
0.68 milliseconds
0.92 seconds
1.4 seconds
75 seconds