Question

7. The cell membrane has tiny holes in it that allow materials to pass into and out of the cell. Skill Challenge Skills: diagramming, using models, applying concepts Each symbol on the diagram below represents either a substance needed or not needed by the cell. These substances pass into or out of the cell by diffusion, using passive transport, Substances moving into the cell are needed by the cell, and substances moving out of the cell are not needed by the cell. Study the diagram below. Draw arrows in the diagram to show whether each substance will move into or out of the cell. Then, answer the questions that follow 1. Is substance X needed or not needed by the cell? Explain. OOO 2. Would substance Y move into or out of the cell? Explain

Answer 1

It is given that the molecules are transported by the diffusion across the cell. The molecules transport inside are needed for the cell.

1) The movement of molecules moves across the cell from high to low concentration. There are 9 X molecules inside the cell whereas 3 X molecules are present outside the cell. That's why X molecules moves outside.Hence the X molecules are not needed by the cell. Because X molecules moves outside. And it is given that molecules move outside are not needed by the cell.

2) There are 7 molecules outside the cell whereas 4 Y molecules are inside the cell. That's why Y molecules moves from outside to inside by diffusion because the movement of molecules from high concentration to the lower concentration.

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