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Questions and Answers
What is the primary characteristic of passive transport?
Which process specifically involves water movement through a selectively permeable membrane?
What type of transport requires energy in the form of ATP?
In what form does active transport typically use energy?
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Which of the following is NOT a characteristic of facilitated diffusion?
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Study Notes
Transport Across the Plasma Membrane
- Cells require a system to allow materials to enter and exit.
- Two main types: Passive Transport and Active Transport
Passive Transport
- No energy required
- Substances move down a concentration gradient, from an area of high concentration to an area of low concentration.
- Examples of Passive Transport:
- Diffusion: The movement of molecules from an area of high concentration to an area of low concentration.
- Facilitated Diffusion: The movement of molecules across a membrane with the help of transport proteins.
- Osmosis: The movement of water across a semi-permeable membrane from an area of high water concentration to an area of low water concentration.
Active Transport
- Requires energy input
- Energy is in the form of ATP
- Moves ions against their concentration gradient
- Types of Active Transport
- Primary Active Transport: Directly uses ATP to move substances across the membrane.
- Secondary Active Transport: Uses the energy stored in the concentration gradient of one substance to move another substance across the membrane.
- Bulk Transport: The movement of large molecules across the membrane by endocytosis or exocytosis.
- Antiport: Two substances move across the membrane in opposite directions
- Symport: Two substances move across the membrane in the same direction.
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Description
This quiz covers the essential concepts of transport mechanisms within cells, focusing on Passive and Active Transport. It includes key processes such as diffusion, osmosis, and the role of ATP in active transport. Test your understanding of how materials move across the plasma membrane.
