In the graph to the right the magnitude of concentration dif

In the graph to the right, the magnitude of concentration difference across the nuclear pore complexes (NPCs) is plotted for four molecules (A to D) as a function of time, starting from an arbitrarily chosen initial concentration difference. Indicate which curve corresponds to each of the following molecules. Put the letter in the corresponding parenthesis.

(   )     A large protein that is being actively transported across the NPC

( )     A small water-soluble molecule

( )    A small protein composed of a few dozen residues

( )     A large protein that is NOT actively transported into or out of the nuclear.

Concentration difference across the nuclear envelope (nM)

Solution

B.             A small water-soluble molecule

D.            A large protein that is NOT actively transported into or out of the nuclear.

C.             A small protein composed of a few dozen residues

A.            A large protein that is being actively transported across the NPC