Passive transport
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Transcript of Passive transport
Passive Transport
Two main points:
• 1) Needs no energy (ATP)
• 2) Substances move from greater to lesser concentration.
Types of Passive Transport
• 1) Diffusion
• 2) Osmosis
• 3) Facilitated Diffusion
Diffusion animation
• Diffusion is:
The movement of molecules from an area of high concentration to an area of lowconcentration.
Diffusion Video
• 1. Simple diffusion is defined as the movement of:
• A) molecules from areas of higher concentration to areas of lower concentration.
• B) molecules from areas of lower concentration to areas of higher concentration.
• C) water molecules across a membrane.
• 2. When sugar is mixed with water, equilibrium is reached when
• A) molecules of sugar stop moving.
• B) water and sugar molecules are moving at the same speed.
• C) the dissolved sugar molecules are evenly distributed throughout the solution.
• 3. The molecules in a solid lump of sugar do not move.
• A) True
• B) False
• 4. Diffusion is one of the processes whereby materials are exchanged between a cell and its environment.
• A) True
• B) False
Osmosis animation
• Osmosis is:
The movement of water molecules from an area of high concentration to an area of low concentration.
Osmosis Video
1) Osmosis is best defined as the movement of
• A) molecules from an area of high concentration to an area of lower concentration.
• B) molecules from an area of low concentration to an area of higher concentration.
• C) water molecules across a membrane from an area of low water to an area of higher concentration.
• D) water molecules across a membrane from an area of high water concentration to an area of lower concentration.
2 Which of the following will pass through a cell
membrane most easily?
• A) small polar molecules
• B) small nonpolar molecules
• C) large polar molecules
• D) large nonpolar molecules
• E) large neutral molecules
3. A red blood cell placed in a hypertonic medium will:
• A) expand.
• B) burst.
• C) shrink.
• D) have no change in shape.
4 A 5% urea solution is hypotonic to a 10% urea solution.
• A) True
• B) False
5. If a cell is placed in an isotonic medium, there will be no net movement of water.
• A) True
• B) False
Facilitated Diffusion
• Facilitated diffusion is:
The movement of molecules from an area of high concentration to an area of low concentration through a channel protein.