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Questions and Answers
What type of transport mechanism does not require energy for the movement of molecules?
What type of transport mechanism does not require energy for the movement of molecules?
Which statement is true regarding facilitated diffusion?
Which statement is true regarding facilitated diffusion?
In what type of solution does the concentration of solute outside the cell exceed that inside the cell?
In what type of solution does the concentration of solute outside the cell exceed that inside the cell?
During osmosis, water movement occurs from areas of _____ concentration to areas of _____ concentration.
During osmosis, water movement occurs from areas of _____ concentration to areas of _____ concentration.
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What describes the process of osmosis?
What describes the process of osmosis?
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What is the nature of the cell membrane in relation to osmotic pressure?
What is the nature of the cell membrane in relation to osmotic pressure?
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Which mechanism is likely to be employed in the transport of ions across the cell membrane?
Which mechanism is likely to be employed in the transport of ions across the cell membrane?
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Which term describes a solution that causes a cell to gain water?
Which term describes a solution that causes a cell to gain water?
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What characterizes an isotonic solution?
What characterizes an isotonic solution?
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In which type of solution do water molecules move at the same rate in both directions?
In which type of solution do water molecules move at the same rate in both directions?
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Which transport mechanism is characterized by the movement of molecules from high to low concentration without the need for energy?
Which transport mechanism is characterized by the movement of molecules from high to low concentration without the need for energy?
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What determines the tonicity of a solution?
What determines the tonicity of a solution?
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What is characteristic of a hypertonic solution?
What is characteristic of a hypertonic solution?
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If a cell is placed in an isotonic solution, what will likely occur?
If a cell is placed in an isotonic solution, what will likely occur?
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Which statement is true regarding osmosis and diffusion?
Which statement is true regarding osmosis and diffusion?
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Which of the following defines a hypotonic solution in relation to a cell?
Which of the following defines a hypotonic solution in relation to a cell?
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What is the primary function of osmosis in cells?
What is the primary function of osmosis in cells?
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What defines a hypotonic solution for animal cells?
What defines a hypotonic solution for animal cells?
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How does diffusion primarily occur in cells?
How does diffusion primarily occur in cells?
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What is the ultimate goal of diffusion in a biological context?
What is the ultimate goal of diffusion in a biological context?
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What happens to plant cells when placed in a hypertonic solution?
What happens to plant cells when placed in a hypertonic solution?
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What can occur when an animal cell is placed in a hypotonic solution?
What can occur when an animal cell is placed in a hypotonic solution?
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What is the effect of a hypertonic solution on an animal cell?
What is the effect of a hypertonic solution on an animal cell?
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How do plant cells respond to varying concentrations of water compared to animal cells?
How do plant cells respond to varying concentrations of water compared to animal cells?
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What does a hypertonic solution contain in terms of solute and water concentrations?
What does a hypertonic solution contain in terms of solute and water concentrations?
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What process causes marine fishes to excrete salts while drinking water?
What process causes marine fishes to excrete salts while drinking water?
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What happens to an animal cell in an isotonic solution?
What happens to an animal cell in an isotonic solution?
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Which solution can cause a cell to burst due to excessive water intake?
Which solution can cause a cell to burst due to excessive water intake?
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What is the term for the relative concentration of solutes in fluids separated by a selectively permeable membrane?
What is the term for the relative concentration of solutes in fluids separated by a selectively permeable membrane?
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Which term describes a solution that causes water to be drawn out of the cell?
Which term describes a solution that causes water to be drawn out of the cell?
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What type of environment is typically faced by paramecia that live in freshwater when eliminating excess water?
What type of environment is typically faced by paramecia that live in freshwater when eliminating excess water?
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In what scenario do plants typically wilt, indicating a hypertonic environment?
In what scenario do plants typically wilt, indicating a hypertonic environment?
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How does facilitated diffusion differ from simple diffusion?
How does facilitated diffusion differ from simple diffusion?
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Which solution has equal solute concentrations inside and outside of the cell?
Which solution has equal solute concentrations inside and outside of the cell?
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What process involves the movement of water across a selectively permeable membrane?
What process involves the movement of water across a selectively permeable membrane?
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Which of the following statements about diffusion is incorrect?
Which of the following statements about diffusion is incorrect?
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Study Notes
Cell Transport Mechanisms: Diffusion and Osmosis
- Water is essential for life to persist
- Plants wilt when not watered due to insufficient water in cells
- Animals drink water for biochemical processes, not just thirst
- Water has various properties supporting life
- Water molecules move across a membrane
Diffusion
- Diffusion is the movement of molecules down their concentration gradient.
- Movement from an area of high concentration to low concentration
- Diffusion results in dynamic equilibrium
- Diffusion is passive transport. It doesn't require energy.
- Solute molecules move passively to achieve equilibrium
- Simple diffusion involves molecules moving directly across a membrane
- Facilitated diffusion uses channel or carrier proteins to move molecules across a membrane
Osmosis
- Osmosis is the diffusion of water across a selectively permeable membrane.
- Movement from high water concentration to low water concentration
- Isotonic solutions have equal solute concentration inside and outside the cell. No net movement of water.
- Hypotonic solutions have a lower solute concentration outside the cell than inside. Water moves into the cell. Can cause animal cells to swell or burst
- Hypertonic solutions have a higher solute concentration outside the cell than inside. Water moves out of the cell. Can cause animal cells to shrink or shrivel
- Plant cells react differently than animal cells
Tonicity
- Tonicity describes a solution's ability to cause a cell to gain or lose water.
- Based on the relative concentration of solutes compared to the cell.
- Solutions can be isotonic, hypotonic, or hypertonic
- Can also be used to classify external solutions relative to internal solutions
Additional Notes
- Marine animals drink seawater but actively excrete excess salts to maintain internal water balance.
- Cells require proper fluid balance for optimal functioning
- Plant cells do not change size as much with water concentration changes compared to animal cells.
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Description
Test your knowledge on the concepts of diffusion and osmosis in biological systems. Understand how water and solute molecules move across membranes, and the importance of these processes in maintaining cellular balance. This quiz covers essential definitions, mechanisms, and examples related to cell transport.
