Scientific notation is often used to express numbers. when is scientific notation more appropriate than standard notation?
a) for numbers that contain fractions.
b) for very large or very small numbers.
c) for measured values during experiments.
d) for numbers and computations during science class.

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.