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Questions and Answers
What type of transport requires energy from the cell?
What type of transport requires energy from the cell?
- Active transport (correct)
- Passive transport
- Osmosis
- Diffusion
In which type of transport does a substance move from high to low concentration?
In which type of transport does a substance move from high to low concentration?
- Simple diffusion (correct)
- Osmosis
- Active transport
- Facilitated diffusion (correct)
Which process allows water to move from an area of high concentration to an area of low concentration?
Which process allows water to move from an area of high concentration to an area of low concentration?
- Osmosis (correct)
- Active transport
- Simple diffusion
- Facilitated diffusion
What characteristic distinguishes facilitated diffusion from simple diffusion?
What characteristic distinguishes facilitated diffusion from simple diffusion?
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Which of the following describes an ion channel?
Which of the following describes an ion channel?
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What is the term for a compartment with a lower solute concentration?
What is the term for a compartment with a lower solute concentration?
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Study Notes
Active Transport
- Requires cellular energy (ATP) to function.
- Moves substances against their concentration gradient (from low to high concentration).
Passive Transport
Diffusion
- Movement of substances from high to low concentration areas.
- Simple diffusion:
- Occurs directly through the lipid bilayer without assistance.
- Examples include gases like carbon dioxide and oxygen.
- Facilitated diffusion:
- Involves specific membrane proteins called permeases for quicker transport.
- Each protein is selective, transporting only one type of molecule.
- Ion channels:
- Specialized proteins that allow specific ions to pass through.
- Often activated by stimuli such as voltage changes (e.g., voltage-gated sodium channels).
Osmosis
- The process of water movement across a membrane.
- Water moves from areas of high water concentration (low solute concentration) to low water concentration (high solute concentration).
- Compartment with higher solute concentration is termed hypertonic.
- Compartment with lower solute concentration is termed hypotonic.
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Description
Learn about active and passive transport mechanisms in cells, including diffusion and how substances move across the plasma membrane.
