Why is dna replication necessary before each cell division?

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.

Each nephron is made up of capillaries that form the __ sweat glands bladder glomerulus ureter

The function of the ciliary escalator is to