In the Following Graph, the Magnitude of Concentration Difference Across

Short Answer

In the following graph, 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. Your answer would be a four-letter string composed of letters A to D only, e.g. ABCD.

( ) 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 nucleus