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Multiple Choice
Seawater is hypertonic to cytoplasm in vertebrate cells and in plant cells. If a red blood cell and a plant cell were placed in seawater, what would happen to the two types of cells?
A
The red blood cell would burst, and the plant cell would shrink.
B
Both cells will gain water, but cell walls will prevent both cells from bursting.
C
Both cells would gain water by osmosis; the red blood cell would burst, and the plant cell would increase in turgor pressure.
D
The red blood cell would shrink, and the plant cell would gain water.
E
Both cells would lose water; the red blood cell would shrivel, and the plant plasma membrane would pull away from the cell wall.
Verified step by step guidance
1
Understand the concept of tonicity: Tonicity refers to the relative concentration of solutes in two solutions separated by a semipermeable membrane. A hypertonic solution has a higher concentration of solutes compared to another solution.
Identify the environment: Seawater is hypertonic to the cytoplasm of both red blood cells and plant cells, meaning seawater has a higher concentration of solutes than the cytoplasm inside these cells.
Predict the movement of water: In a hypertonic environment, water will move out of the cells to the area of higher solute concentration (seawater) through osmosis, which is the movement of water across a semipermeable membrane.
Consider the effects on red blood cells: As water leaves the red blood cells, they will lose volume and shrivel because they lack a cell wall to maintain their shape.
Consider the effects on plant cells: As water leaves the plant cells, the plasma membrane will pull away from the rigid cell wall, a process known as plasmolysis, causing the plant cell to shrink.