Multiple Choice
The internal solute concentration of a plant cell is about 0.8 M. To demonstrate plasmolysis, it would be necessary to suspend the cell in what solution?
6. The Membrane
Osmosis
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Green olives may be preserved in brine, which is a 30% salt solution. How does this method of preservation prevent microorganisms from growing in the olives?
A
Bacterial cells shrivel up in high salt solutions, causing the cell to burst.
B
High salt concentration lowers the pH, thus inhibiting bacterial metabolism.
C
High salt concentration raises the pH, thus inhibiting bacterial metabolism.
D
A 30% salt solution is hypotonic to the bacteria, so they gain too much water and burst.
E
A 30% salt solution is hypertonic to the bacteria, so they lose too much water and undergo plasmolysis.
Verified step by step guidance1
Understand the concept of osmosis: Osmosis is the movement of water across a semipermeable membrane from an area of low solute concentration to an area of high solute concentration.
Define hypertonic solution: A hypertonic solution has a higher concentration of solutes compared to the inside of a cell, causing water to move out of the cell.
Explain plasmolysis: Plasmolysis occurs when a cell loses water in a hypertonic environment, leading to the cell membrane pulling away from the cell wall, which can inhibit cell function and growth.
Relate the concept to the problem: In a 30% salt solution, the environment outside the bacterial cells is hypertonic, causing water to move out of the bacterial cells.
Conclude the effect on bacteria: As water exits the bacterial cells, they undergo plasmolysis, which prevents them from growing and reproducing, thus preserving the olives.
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