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Questions and Answers
What is osmosis best defined as?
What is osmosis best defined as?
The movement of water molecules across a membrane from an area of high water concentration to an area of lower concentration.
Which of the following will pass through a cell membrane most easily?
Which of the following will pass through a cell membrane most easily?
- Glucose
- Ions
- Large polar molecules
- Small nonpolar molecules (correct)
What happens to a red blood cell placed in a hypertonic medium?
What happens to a red blood cell placed in a hypertonic medium?
It will shrink.
A 5% urea solution is hypotonic to a 10% urea solution.
A 5% urea solution is hypotonic to a 10% urea solution.
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If a cell is placed in an isotonic medium, there will be no net movement of water.
If a cell is placed in an isotonic medium, there will be no net movement of water.
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Study Notes
Osmosis Overview
- Defined as the movement of water molecules through a semi-permeable membrane.
- Water moves from areas of high concentration to areas of low concentration.
Membrane Permeability
- Small nonpolar molecules pass through cell membranes more easily than other types.
- Membrane permeability is crucial for substance transport in and out of cells.
Red Blood Cell Response
- A red blood cell in a hypertonic environment will experience osmosis and lose water, resulting in shrinkage.
- Understanding cell behavior in various solute concentrations is key in biology.
Urea Solutions Concentration
- A 5% urea solution is not hypotonic compared to a 10% urea solution.
- Hypertonic, isotonic, and hypotonic solutions affect cell volume in different ways.
Isotonic Conditions
- In an isotonic medium, there is no net movement of water molecules into or out of the cell.
- Cells maintain equilibrium, which is vital for homeostasis.
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