Podcast
Questions and Answers
Which of the following is the process that describes the movement of tea particles from tea leaves into hot water during brewing?
Which of the following is the process that describes the movement of tea particles from tea leaves into hot water during brewing?
- Diffusion (correct)
- Active transport
- Osmosis
- Endocytosis
Active transport requires energy to move molecules across a membrane.
Active transport requires energy to move molecules across a membrane.
True (A)
What are the two main types of membrane transport? Which one relies on the kinetic energy of molecules?
What are the two main types of membrane transport? Which one relies on the kinetic energy of molecules?
The two main types of membrane transport are passive transport and active transport. Passive transport relies on the kinetic energy of molecules.
The net movement of particles from a region of ______ concentration to a region of ______ concentration is called diffusion.
The net movement of particles from a region of ______ concentration to a region of ______ concentration is called diffusion.
Which of the following is the primary process involved in brewing tea?
Which of the following is the primary process involved in brewing tea?
Hot water will brew tea faster than cold water because the higher temperature increases the rate of diffusion.
Hot water will brew tea faster than cold water because the higher temperature increases the rate of diffusion.
What is the primary factor that determines the direction of movement of particles during diffusion?
What is the primary factor that determines the direction of movement of particles during diffusion?
Diffusion is the net movement of particles from a region of higher ______ to a region of lower ______.
Diffusion is the net movement of particles from a region of higher ______ to a region of lower ______.
Match the following factors to their effect on the rate of diffusion:
Match the following factors to their effect on the rate of diffusion:
Which type of transport requires the cell to expend energy?
Which type of transport requires the cell to expend energy?
The fluid mosaic model describes the structure of the cell membrane.
The fluid mosaic model describes the structure of the cell membrane.
What is the main difference between diffusion and osmosis?
What is the main difference between diffusion and osmosis?
The movement of molecules across a cell membrane without requiring energy is called ______ transport.
The movement of molecules across a cell membrane without requiring energy is called ______ transport.
Which of the following is NOT a factor that affects the rate of diffusion?
Which of the following is NOT a factor that affects the rate of diffusion?
Flashcards
Diffusion
Diffusion
The net movement of particles from high to low concentration.
Osmosis
Osmosis
The movement of water across a semipermeable membrane.
Passive Transport
Passive Transport
Movement of molecules without energy, relying on kinetic energy.
Active Transport
Active Transport
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Factors Affecting Diffusion
Factors Affecting Diffusion
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Concentration Gradient
Concentration Gradient
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Fluid Mosaic Model
Fluid Mosaic Model
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Temperature's Role in Diffusion
Temperature's Role in Diffusion
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Mass of Particles
Mass of Particles
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Importance of Transport
Importance of Transport
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Study Notes
Brewing Tea
- Tea brewing involves diffusion.
- Diffusion is the movement of particles from an area of high concentration to an area of low concentration.
- The particles, in this instance, are tea molecules.
- The tea molecules move from the teabag into the surrounding water.
- Hot water brews tea faster than cold water because the higher temperature increases the kinetic energy of the particles allowing for them to move more quickly.
Defining Diffusion/Osmosis
- Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration down a concentration gradient.
- Passive transport does not require additional energy.
- Osmosis is the net movement of water across a semi-permeable membrane from an area of high water concentration (low solute concentration) to an area of low water concentration (high solute concentration).
Types of Transport
- Passive transport: Movement of molecules without requiring additional energy. It relies solely on the kinetic energy of the molecules.
- Active transport: Movement of molecules that requires additional energy in the form of ATP (adenosine triphosphate).
Factors Affecting Diffusion Rate
- Temperature: Higher temperature leads to faster diffusion.
- SA:V ratio: Larger SA:V ratio results in faster diffusion.
- Concentration gradient: Steeper gradient leads to faster diffusion.
- Size/mass of particles: Smaller particles diffuse faster.
- Distance: Shorter distance means faster diffusion.
- Diffusion medium: Gas → Fastest, Liquid → Faster, Solid → Slowest.
- Membrane nature: The properties of a membrane can affect the rate at which substances can pass through it (e.g. fat-soluble molecules diffuse faster than water-soluble molecules through a bilayer membrane).
Significance of Diffusion in Living Systems
- Gaseous exchange in lungs: Oxygen diffuses from alveoli into the blood, and carbon dioxide diffuses from the blood into the alveoli.
- Nutrient uptake in roots: Mineral ions from the soil diffuse into the root hair cells.
- Diffusion is crucial for essential functions like nutrient absorption, waste removal, and gas exchange in living organisms.
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