What would happen to the amount of tryptophan being produced in an e. coli cell when the repressor is attached to the operator?

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

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.

Up to what percentage of the world's flora consisted of cycads during the triassic period? 100% 75% 50% 20%