2. Which direction (into or out of the cell) would you expect surcrose to move i

Question

2. Which direction (into or out of the cell) would you expect surcrose to move if it can? What do you need to have for sucrose to move?(be very specific)

3. Assuming Na+ can move, what will the concentrations of Na+ and sucrose eventually become?

4. After diffusion has occured, label the inside and outside of the cell as hypertonic, isotonic, or hypotonic as appropiate.

5. Will water move into or out of the cell based on your answer for number 4

Consider the figure below when answering the following questions. Assume it define th starting conditions for an experiment with a cell in a solution. Sucrose = 0.2 M Na+ = 2.0 M Sucrose = 1.0 M Na+ = 0.5 M

Explanation / Answer

1. As the concentration of Na is more inside the cell, it will come out. A Na export channel means Na symporter is required.

2. As the concentration of sucrose is more outside the cell, it will go inside. Generally, sucrose can't move through cell. They can only enter the bacterial cell via porins named ScrA.

3. The concentration will be come to equilibrium. Na+ will be 2+0.5/2 = 1.25

Sucrose will remain same

4. As, the concentration of Na is same in both side, but sucrose concentration is more outside. The cell is hypotonic.

5. Water will come from inside to outside to maintain the tonicity

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