Podcast
Questions and Answers
Which of the following best describes the role of kinetic energy in simple diffusion?
Which of the following best describes the role of kinetic energy in simple diffusion?
- It directly moves molecules from an area of low concentration to an area of high concentration.
- It drives the movement of molecules down their concentration gradient. (correct)
- It is converted into hydrostatic pressure to force molecules through the membrane.
- It provides the energy for carrier proteins to transport molecules across the membrane.
A scientist observes that a particular molecule crosses a plasma membrane down its concentration gradient with the assistance of a membrane protein. Which transport process is most likely responsible for this movement?
A scientist observes that a particular molecule crosses a plasma membrane down its concentration gradient with the assistance of a membrane protein. Which transport process is most likely responsible for this movement?
- Active transport
- Simple diffusion
- Facilitated diffusion (correct)
- Filtration
How does facilitated diffusion differ from simple diffusion?
How does facilitated diffusion differ from simple diffusion?
- Facilitated diffusion requires energy input, while simple diffusion does not.
- Facilitated diffusion requires the assistance of a membrane protein, while simple diffusion does not. (correct)
- Facilitated diffusion moves molecules against their concentration gradient, while simple diffusion moves them down their concentration gradient.
- Facilitated diffusion is limited to the transport of water, while simple diffusion transports a wider range of molecules.
In the context of membrane transport, what distinguishes a solvent from a solute within a solution?
In the context of membrane transport, what distinguishes a solvent from a solute within a solution?
Which of the following transport processes relies on hydrostatic pressure as its driving force?
Which of the following transport processes relies on hydrostatic pressure as its driving force?
Which of the following accurately describes the primary difference between facilitated diffusion and active transport?
Which of the following accurately describes the primary difference between facilitated diffusion and active transport?
The Sodium-Potassium (Na+/K+) pump is a vital example of active transport. What is the primary function of this pump in maintaining cellular function?
The Sodium-Potassium (Na+/K+) pump is a vital example of active transport. What is the primary function of this pump in maintaining cellular function?
Exocytosis and endocytosis are both types of vesicular transport. What key feature distinguishes them?
Exocytosis and endocytosis are both types of vesicular transport. What key feature distinguishes them?
Phagocytosis is often referred to as 'cell eating'. What is the primary purpose of phagocytosis in the body?
Phagocytosis is often referred to as 'cell eating'. What is the primary purpose of phagocytosis in the body?
Receptor-mediated endocytosis is a highly selective process. How does it differ from pinocytosis and phagocytosis?
Receptor-mediated endocytosis is a highly selective process. How does it differ from pinocytosis and phagocytosis?
Flashcards
Active Transport
Active Transport
The movement of substances across a membrane using ATP against the concentration gradient.
Na+-K+ Pump
Na+-K+ Pump
A type of solute pump that moves 3 sodium ions out and 2 potassium ions into the cell using ATP.
Vesicular Transport
Vesicular Transport
Transport method involving vesicles to move substances in bulk without crossing the membrane directly.
Exocytosis
Exocytosis
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Endocytosis
Endocytosis
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Diffusion
Diffusion
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Simple Diffusion
Simple Diffusion
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Facilitated Diffusion
Facilitated Diffusion
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Filtration
Filtration
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Solution
Solution
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Study Notes
Membrane Transport
- Membrane transport involves the movement of substances across cell membranes.
- Passive processes don't require energy.
- Active processes use energy.
- Vesicular transport involves using vesicles to move substances.
Passive Processes
- Diffusion: Molecules move from high concentration to low concentration.
- Simple diffusion: Unassisted movement across the membrane. Examples include oxygen (O2), carbon dioxide (CO2), and lipids.
- Facilitated diffusion: Requires a protein channel or carrier. Examples include glucose and some amino acids.
- Filtration: Forceful movement of water and solutes across a membrane due to hydrostatic pressure. An example is blood vessels.
Active Processes
- ATP is used to move molecules against their concentration gradient (from low concentration to high).
- Sodium-Potassium Pump (Na+-K+ pump) is an example of active transport, moving sodium out and potassium into cells.
Vesicular Transport
- Involves using vesicles to move substances in or out of a cell.
- Exocytosis: Moves substances out of the cell.
- Endocytosis: Moves substances into the cell.
- Phagocytosis: Engulfs large particles (e.g., bacteria).
- Pinocytosis: Takes up liquid droplets.
- Receptor-mediated endocytosis: Specific uptake of target molecules.
Solutions
- Solutions are homogenous mixtures of two or more components.
- Solvent: The substance present in the larger amount (e.g., water in saltwater).
- Solute: The substance present in the smaller amount (e.g., salt in saltwater).
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