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Use arrows to indicate the direction of diffusion in each case: ○ is a molecule that can pass through the...

10. Use arrows to indicate the direction of diffusion in each case: ○ is a molecule that can pass through the cell membrane. □ is a cell membrane.
A:
B:
11. For each of the situations below use an arrow to indicate the net movement of sugar into or out of the cell. (Assume that the sugar molecules can pass through the cell membrane in each case.)
Or describe which direction the sugar would move here:
Left Cell:
Middle Cell:
Right Cell:

Answer

  1. 10. A: Molecules will move from an area of higher concentration to an area of lower concentration. In diagram A, the molecules will move from inside the cell to outside the cell.

    B: In diagram B, the molecules will move from outside the cell to inside the cell.

  2. 11. Left Cell: Sugar will move from the outside (5% sugar) to the inside (1% sugar).

    Middle Cell: Sugar will move from the inside (3% sugar) to the outside (1% sugar).

    Right Cell: Sugar will move from the inside (1% sugar) to the outside (1% sugar), but since the concentrations are equal, there will be no net movement.

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