You inject two dyes of different sizes and colors into one cell connected to ano

Question

You inject two dyes of different sizes and colors into one cell connected to another cell by gap junctions. You find that the 1200 MW red dye passes to the other cell, but the 2000 MW green dye is retained in the injected cell. What can you conclude about gap junctions?

A.The gap junction tunnel is wide enough to pass molecules 2000 MW and smaller.

B.The gap junction tunnel is too narrow to pass molecules 2000 MW and larger.

C.The gap junction tunnel can only pass molecules larger than 1200 but smaller than 2000 MW.

D.It is impossible to estimate the size molecules that can pass through a gap junction without knowing the length of the tunnel.

Explanation / Answer

B. The gap junction tunnel is too narrow to pass molecules 2000MW and Larger. It is widely conidered that, small hydrophilic molecules as well as ions can pass through gap junctions. Relatively arger molecules could not traverse through the tunnels of gap junction.

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