One of the largest emeralds ever discoverd had a mass of 17.23kg. Assuming it's density to be 4.02g/cm, what was the emeralds volume?

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.