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Questions and Answers
Which reason best explains why the cell membrane helps the cell maintain homeostasis?
Which reason best explains why the cell membrane helps the cell maintain homeostasis?
- The cell membrane is selectively permeable. (correct)
- The cell membrane is both hydrophilic and hydrophobic.
- The cell membrane is composed of lipids and phosphates.
- The cell membrane is a bilayer structure.
Which solution would most likely cause a plant placed in it to become firmer and more rigid?
Which solution would most likely cause a plant placed in it to become firmer and more rigid?
- Osmotic
- Isotonic
- Hypotonic (correct)
- Hypertonic
What is the movement of water from an area of high water concentration to an area of low water concentration called?
What is the movement of water from an area of high water concentration to an area of low water concentration called?
osmosis
For diffusion to occur, which condition must be met?
For diffusion to occur, which condition must be met?
Which best describes dynamic equilibrium?
Which best describes dynamic equilibrium?
Which best describes the difference between osmosis and diffusion?
Which best describes the difference between osmosis and diffusion?
In which solution might a cell maintain homeostasis through diffusion?
In which solution might a cell maintain homeostasis through diffusion?
Which homeostatic process requires energy to move particles across the plasma membrane?
Which homeostatic process requires energy to move particles across the plasma membrane?
What would most likely happen to a unicellular organism if it was exposed to a hypotonic solution for an extended period of time?
What would most likely happen to a unicellular organism if it was exposed to a hypotonic solution for an extended period of time?
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Study Notes
Cell Membrane and Homeostasis
- The cell membrane's selective permeability allows for the regulation of substances entering and leaving the cell, helping maintain homeostasis.
- Composed of lipids and phosphates, the membrane's structure supports its dual hydrophilic and hydrophobic properties.
Solutions Affecting Plant Cells
- A hypotonic solution causes plant cells to become firmer and more rigid due to water influx, expanding the vacuole and increasing turgor pressure.
Water Movement in Cells
- Osmosis refers to the movement of water from an area of high water concentration to an area of low water concentration, crucial for cellular homeostasis.
Conditions for Diffusion
- Diffusion requires a concentration gradient, where particles move from an area of high concentration to one of low concentration.
Dynamic Equilibrium
- Dynamic equilibrium occurs when particles move into and out of the cell at equal rates, resulting in stable concentrations inside and outside the cell.
Difference Between Osmosis and Diffusion
- Diffusion involves the movement of particles from high to low particle concentration, while osmosis specifically refers to water movement from high to low water concentration.
Maintaining Homeostasis through Diffusion
- Cells maintain homeostasis in an isotonic solution, where water concentration is balanced, allowing for optimal particle movement without net gain or loss.
Energy in Transport Processes
- Active transport requires energy to move particles across the plasma membrane against a concentration gradient, differentiating it from passive transport processes.
Impact of Hypotonic Solutions on Unicellular Organisms
- A unicellular organism exposed to a hypotonic solution for an extended period would swell and potentially burst due to excessive water intake.
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