Questions and Answers
What would most likely happen to a unicellular organism if it was exposed to a hypotonic solution for an extended period of time?
It would swell and then burst.
Which mechanism of ion uptake would best enable a plant to produce a steady supply of chlorophyll?
Active transport
Which homeostatic process moves particles against a concentration gradient?
Active transport
Which reason best explains why the cell membrane helps the cell maintain homeostasis?
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Which homeostatic process is characterized by the diffusion of water molecules?
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For diffusion to occur, which condition must be met?
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Which motion of particles across a membrane requires energy?
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Which solution would most likely cause a plant placed in it to become firmer and more rigid?
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Which adaptation is used by polar bears to maintain internal homeostasis in cold temperatures?
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Which homeostatic process requires energy to move particles across the plasma membrane?
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Which best defines homeostasis?
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Which movement of particles would be most affected by a disorder that causes damage to carrier proteins?
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Which best describes dynamic equilibrium?
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The role of the cell membrane is most like the job of which person?
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How does excreting waste as uric acid help reptiles and birds maintain internal homeostasis in hot climates?
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How would the contractile vacuole of a freshwater amoeba respond if the organism was placed in seawater?
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The movement of water from an area of high water concentration to an area of low water concentration is: ______
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Based on the data in the graph, which would most likely happen if the paramecium were placed in distilled water?
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Study Notes
Cell Homeostasis Concepts
- Unicellular organisms in a hypotonic solution may swell and burst due to water influx.
- Chlorophyll, essential for photosynthesis, requires magnesium which is absorbed via active transport from root-hair cells.
- Active transport is a process that moves particles against a concentration gradient, requiring energy.
Cell Membrane Function
- The cell membrane is selectively permeable, regulating the internal environment and maintaining homeostasis.
- Osmosis is the diffusion of water molecules across a membrane, crucial for cell integrity.
- A concentration gradient must exist for diffusion to occur; it facilitates the movement from areas of high to low concentration.
Energy Requirements in Transport
- Movement from low concentration to high concentration necessitates energy; this is indicative of active transport.
- Solutions that are hypotonic can make plant cells firmer and more rigid by promoting water uptake.
Adaptations for Homeostasis
- Polar bears maintain internal temperature and homeostasis in cold climates through the adaptation of blubber.
- Reptiles and birds excrete uric acid as a means to conserve water in hot environments.
Dynamic Equilibrium
- Dynamic equilibrium occurs when particles move in and out of a cell while maintaining stable concentrations, ensuring balance.
- Damage to carrier proteins would most significantly impact active transport mechanisms, disrupting nutrient uptake.
Water Regulation in Cells
- The body relies heavily on water; osmosis ensures that cells can manage water levels, moving from high to low concentration areas.
- In a hypertonic solution, such as seawater, a freshwater amoeba's contractile vacuole would respond with fewer contractions due to lower water intake needs.
Graph Interpretation
- If a paramecium placed in a hypertonic salt solution is moved to distilled water, it would result in an increase in contractions as it attempts to expel excess water.
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Description
Test your knowledge of cell homeostasis with these flashcards. Learn about the effects of hypotonic solutions on unicellular organisms and the role of magnesium in chlorophyll for photosynthesis. Perfect for biology students!
