Question

part 4: passive transport review
match the structure/process to the letter:

1. phospholipid bilayer _
2. osmosis _
3. simple diffusion _
4. facilitated diffusion _
5. channel protein _
6. this cell would be in a hypertonic / hypotonic / isotonic solution.
7. all of the processes in the image are examples of active / passive transport.
8. the cell membrane can be described as semi - permeable / impermeable
9. there is more glucose inside / outside the cell. (hint: look at the direction it is moving)
10. over time, this cell will shrink / swell

part 5: review of osmosis

1. in the diagram below, draw the direction that water will move in each of the beakers.
2. in the diagram above, label each beaker whether it is hypertonic, hypotonic, or isotonic.

Explanation:

1. The phospholipid bilayer is the main structure of the cell - membrane, shown as the double - layer of circles (B). Osmosis is the diffusion of water across a semi - permeable membrane, indicated by the water movement (X). Simple diffusion is the movement of small non - polar molecules like oxygen (Y). Facilitated diffusion uses transport proteins for larger or polar molecules like glucose (Z). Channel protein is part of the facilitated diffusion structure (A).
2. For question 6, since water is moving out of the cell, it's in a hypertonic solution. All the processes in the image are passive transport as they don't require energy. The cell membrane is semi - permeable. Glucose is moving into the cell, so there is more glucose outside. As water is leaving the cell, over time it will shrink.
3. In part 5, for a, since the salt concentration is the same inside and outside the cell, there is no net water movement. For b, water will move into the cell as the outside has a lower salt (higher water) concentration. For c, water will move out of the cell as the outside has a higher salt concentration. Beaker a is isotonic, b is hypotonic, and c is hypertonic.

Answer:

1. B, X, Y, Z, A
2. hypertonic
3. passive
4. semi - permeable
5. outside
6. shrink
7. a. no net water movement; b. water moves into the cell; c. water moves out of the cell
8. a. isotonic; b. hypotonic; c. hypertonic