Why should scientific investigations be replicable

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?

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.

Which particle controls what element an atom is?