You have discovered a membrane transporter that mediates the import of leucine i

Question

You have discovered a membrane transporter that mediates the import of leucine into the cytosol from the bloodstream. It utilizes the electrochemical gradient of Cl- to pump leucine uphill the concentration gradient. You replaced blood with an isotonic solution that contains the equal concentration of leucine as in the bloostream, but without any Cl-. What will happen?

A. the concentration of leucine inside and outside of cells will become the same

B. Leucine doesnt need an active transport since its side chaim is non polar

C. Leucine will be actively transported out from the cytosol

D. Cl- will be actively imported while leucine gets exported

Explanation / Answer

Ans a) The concentration of the leucine inside and outside of the cells will become the same. It is because the blood has been replaced with an isotonic solution. Hence, it has the same osmotic pressures across the semi-permeable membranes which enables free water movement but keeps the concentration of the leucine on both the side.

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