Biology 2e
2nd Edition
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter4: Cell Structure
Section: Chapter Questions
Problem 3VCQ: Figure 4.18 If a peripheral membrane protein were synthesized in the lumen (inside) of the ER, would...
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Why does water enter a cell that is placed in a hypotonic solution?

Transcribed Image Text:### Osmosis and Cell Solutions
#### U-tube Demonstration of Osmosis
**Before Osmosis:**
- The diagram shows a U-tube with a selectively permeable membrane at the base.
- The left side contains a high concentration of water molecules as indicated by small dots, and fewer sugar molecules depicted by larger dots.
- The right side has a lower concentration of water molecules and more sugar molecules.
- Water molecules move across the permeable membrane, while sugar molecules cannot pass through.
**After Osmosis:**
- Water levels equalize, with water moving to the side with more solute (sugar molecules) to balance concentrations, demonstrating osmosis.
#### Cells in Different Solutions
**Cell in Isotonic Solution:**
- Contains equal concentrations of water molecules and dissolved particles inside and outside the cell.
- Water molecules move in and out at the same rate, keeping the cell stable.
**Cell in Hypotonic Solution:**
- Surrounding solution has more water molecules than dissolved particles compared to inside the cell.
- Water enters the cell by osmosis, causing the cell to swell.
**Cell in Hypertonic Solution:**
- Surrounding solution has more dissolved particles and fewer water molecules compared to inside the cell.
- Water leaves the cell by osmosis, causing the cell to shrink.
> **Refer to the U-tube pictures above when answering the questions below.**
These diagrams visually represent how osmosis affects the movement of water in different environments and helps in understanding cellular responses in varying solutions.
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