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Questions and Answers
What is the main difference between passive transport and active transport?
What is the main difference between passive transport and active transport?
- Passive transport does not require energy, while active transport does. (correct)
- Passive transport involves the use of protein pumps, while active transport does not.
- Passive transport only occurs in plant cells, while active transport only occurs in animal cells.
- Passive transport moves particles from low to high concentration, while active transport moves particles from high to low concentration.
Which process is an example of passive transport?
Which process is an example of passive transport?
- Exocytosis
- Osmosis
- Endocytosis
- Diffusion (correct)
Why does active transport require energy?
Why does active transport require energy?
- To prevent particles from entering the cell.
- To move particles from an area of higher concentration to an area of lower concentration.
- To move particles from an area of lower concentration to an area of higher concentration. (correct)
- To allow the cell to rest and conserve energy.
In which type of cells would active transport be particularly important for function?
In which type of cells would active transport be particularly important for function?
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Study Notes
Transport Across Cell Membranes
- The main difference between passive transport and active transport is the direction of transport and the requirement of energy.
Passive Transport
- Passive transport is the movement of molecules from an area of higher concentration to an area of lower concentration, without using energy.
- Example: Osmosis, the movement of water molecules through a selectively permeable membrane into a solution with higher solute concentration.
Active Transport
- Active transport is the movement of molecules from an area of lower concentration to an area of higher concentration, requiring energy.
- Energy is required to pump molecules against their concentration gradient.
- Important in cells that need to maintain specific internal environments, such as nerve cells, which require high concentrations of certain ions to transmit signals.
Cell Function and Active Transport
- Active transport is particularly important for function in cells that require specific internal environments, such as nerve cells, to maintain their function.
- In these cells, active transport helps maintain the necessary ion balance and concentration gradients.
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