How do we know green light is not absorbed by chlorophyll?

What are the doorways into and out of cells, attached to the membrane, and built in the rough er.

Describe characteristics of a good respitory surface

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.