Podcast
Questions and Answers
What is the primary direction of particle movement during diffusion?
What is the primary direction of particle movement during diffusion?
- From high concentration to low concentration (correct)
- Randomly with no specific direction
- Only vertically downwards
- From low concentration to high concentration
Which of the following substances can readily diffuse through a cell membrane?
Which of the following substances can readily diffuse through a cell membrane?
- Proteins
- Glucose
- Starch
- Oxygen (correct)
What factor does NOT affect the rate of diffusion?
What factor does NOT affect the rate of diffusion?
- Temperature
- Color of the substance (correct)
- Concentration difference
- Surface area
During the diffusion process, what does 'net movement' refer to?
During the diffusion process, what does 'net movement' refer to?
How does the concentration difference influence diffusion?
How does the concentration difference influence diffusion?
Which scenario best illustrates the concept of diffusion in gases?
Which scenario best illustrates the concept of diffusion in gases?
Which of the following correctly describes diffusion?
Which of the following correctly describes diffusion?
Which of these substances is likely to diffuse the slowest through a cell membrane?
Which of these substances is likely to diffuse the slowest through a cell membrane?
Flashcards
What is diffusion?
What is diffusion?
The movement of particles from an area of high concentration to an area of low concentration.
Define 'diffusion'.
Define 'diffusion'.
The spreading out of particles from an area of higher concentration to an area of lower concentration.
How do cell membranes allow substances to pass through?
How do cell membranes allow substances to pass through?
Cell membranes are selectively permeable, meaning they allow some substances to pass through while blocking others. Small molecules like oxygen, glucose, amino acids, and water can diffuse across the membrane, while larger molecules like starch and proteins can't.
What is the direction of net movement during diffusion?
What is the direction of net movement during diffusion?
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What factors affect the rate of diffusion?
What factors affect the rate of diffusion?
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Why is oxygen important for cells, and how does it enter the cell?
Why is oxygen important for cells, and how does it enter the cell?
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Why is glucose important for cells, and how does it enter the cell?
Why is glucose important for cells, and how does it enter the cell?
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Why are amino acids important for cells, and how do they enter the cell?
Why are amino acids important for cells, and how do they enter the cell?
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Study Notes
Diffusion
- Diffusion is the gradual movement of particles from areas of high concentration to areas of low concentration.
- It's the natural tendency for substances to spread out.
- Particles move randomly, eventually becoming evenly distributed.
- This movement is crucial for substances to enter and exit cells.
Diffusion in Solutions and Gases
- Diffusion occurs in both solutions and gases because particles move randomly.
- Different gases can diffuse through each other.
Example of Diffusion
- Spraying perfume in a room: the smell spreads throughout the room as perfume particles move from a concentrated area to a less concentrated one.
Diffusion Across Cell Membranes
- Cell membranes allow substances to pass in and out of cells.
- Small molecules like oxygen, glucose, amino acids, and water can diffuse across membranes.
- Larger molecules like starch and protein cannot.
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Description
Explore the process of diffusion, where particles move from high to low concentration areas. This important biological concept is essential for understanding how substances enter and exit cells. From gases to cell membranes, learn how diffusion operates in different contexts with practical examples.
