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Questions and Answers
A scientist observes a substance moving across a cell membrane from an area of high concentration to an area of low concentration without the use of cellular energy. Which process is most likely responsible for this movement?
A scientist observes a substance moving across a cell membrane from an area of high concentration to an area of low concentration without the use of cellular energy. Which process is most likely responsible for this movement?
- Facilitated diffusion
- Active transport
- Endocytosis
- Simple diffusion (correct)
Which of the following cellular transport mechanisms relies primarily on channel proteins to facilitate the movement of specific ions across the cell membrane?
Which of the following cellular transport mechanisms relies primarily on channel proteins to facilitate the movement of specific ions across the cell membrane?
- Facilitated diffusion via ion channels (correct)
- Active transport
- Simple diffusion
- Osmosis
What would happen to a cell placed in a hypertonic solution?
What would happen to a cell placed in a hypertonic solution?
- The cell will remain the same size.
- The cell will shrink as water moves out. (correct)
- The cell will actively transport water into itself.
- The cell will swell and may burst.
Which of the following transport processes requires the cell to expend energy?
Which of the following transport processes requires the cell to expend energy?
A researcher is studying a cell membrane and observes that water molecules are rapidly crossing the membrane. Which of the following structures is most likely facilitating this movement?
A researcher is studying a cell membrane and observes that water molecules are rapidly crossing the membrane. Which of the following structures is most likely facilitating this movement?
Which of the following best describes osmosis?
Which of the following best describes osmosis?
How does the sodium-potassium pump contribute to maintaining cell volume, and what type of transport is it?
How does the sodium-potassium pump contribute to maintaining cell volume, and what type of transport is it?
A cell membrane is permeable to water but impermeable to solute X. If the concentration of solute X is higher outside the cell than inside, what will happen to the cell?
A cell membrane is permeable to water but impermeable to solute X. If the concentration of solute X is higher outside the cell than inside, what will happen to the cell?
Which characteristic distinguishes active transport from passive transport?
Which characteristic distinguishes active transport from passive transport?
In osmosis, what determines the direction of water movement across a semipermeable membrane?
In osmosis, what determines the direction of water movement across a semipermeable membrane?
Flashcards
Diffusion
Diffusion
Movement of a substance from an area of high concentration to an area of lower concentration.
Diffusion example
Diffusion example
The dispersal of molecules from an area of higher concentration to an area of lower concentration.
Channel Proteins
Channel Proteins
Proteins that create openings for specific substances to pass through the cell membrane.
Facilitated diffusion
Facilitated diffusion
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Passive transport
Passive transport
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Ion channels
Ion channels
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Osmosis
Osmosis
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Isotonic solution
Isotonic solution
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Active transport
Active transport
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Study Notes
- Diffusion is the movement of a substance from an area of high concentration to an area of lower concentration.
- The dispersal of ink in a beaker of water illustrates diffusion.
- Channel proteins act as tunnels for specific substances to pass through the lipid bilayer.
- Sugar molecules utilize facilitated diffusion to cross the cell membrane.
- Diffusion does not require energy.
- Ions pass through ion channels via passive transport.
- Osmosis refers to the diffusion of water into or out of a cell.
- Osmosis is a type of passive transport.
- Water traverses the cell membrane through channel proteins specifically designed for water.
- An isotonic solution has the same solute concentration as the cytoplasm of a cell.
- Unlike passive transport, active transport requires energy.
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