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In the graph to the right, the magnitude of concentration difference across the

ID: 323063 • Letter: I

Question

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)

Explanation / Answer

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

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