What Does Selectively Permeable Mean (Pg. 363)?
Name: Jojo Cohen Date: 12-8-17 Cell Transportation Overview
Directions: Read page 362-374 and use your notes to help you answer the following questions. 1. Illustrate and describe the structure of the cell membrane using figure 2.8 on page 362.
2. What does selectively permeable mean (pg. 363)? A: Selectively permeable means that some substances can pass through the cell membrane while others cannot pass through. 3. What is diffusion and why does it occur? A: The movement of solutes in a solution from high to low concentrations. Diffusion occurs because particles of a substance will move to the less concentrated areas until equilibrium or homeostasis is reached.
4. Compare and contrast diffusion, osmosis, and facilitated diffusion. …show more content…
Osmosis is the diffusion of water and water particles through a selectively permeable membrane. The process in which special chemicals that cannot pass through by themselves are helped by special protein channels is called facilitated diffusion.
Comparisons: Diffusion, Osmosis, and Facilitated Diffusion all involve movement of solutes in a solution from high to low concentrations. They all involve crossing of the cell membrane.
Contrasts: Diffusion occurs between the movement of any particles from high to low concentrations. Osmosis is the movement of water particles through a selectively permeable membrane. Facilitated diffusion is when molecules need help passing through the cell membrane so special proteins help those molecules pass through.
5. Describe osmotic pressure. Why are plant and animal cell affected differently by it? A: When the solute concentration is different, the total water entering or exiting the cell produces a force called osmotic pressure. Animal cells shrink because they only have a cell membrane while plant cells don’t shrink because they have a cell membrane and a cell
Directions: Read page 362-374 and use your notes to help you answer the following questions. 1. Illustrate and describe the structure of the cell membrane using figure 2.8 on page 362.
2. What does selectively permeable mean (pg. 363)? A: Selectively permeable means that some substances can pass through the cell membrane while others cannot pass through. 3. What is diffusion and why does it occur? A: The movement of solutes in a solution from high to low concentrations. Diffusion occurs because particles of a substance will move to the less concentrated areas until equilibrium or homeostasis is reached.
4. Compare and contrast diffusion, osmosis, and facilitated diffusion. …show more content…
Osmosis is the diffusion of water and water particles through a selectively permeable membrane. The process in which special chemicals that cannot pass through by themselves are helped by special protein channels is called facilitated diffusion.
Comparisons: Diffusion, Osmosis, and Facilitated Diffusion all involve movement of solutes in a solution from high to low concentrations. They all involve crossing of the cell membrane.
Contrasts: Diffusion occurs between the movement of any particles from high to low concentrations. Osmosis is the movement of water particles through a selectively permeable membrane. Facilitated diffusion is when molecules need help passing through the cell membrane so special proteins help those molecules pass through.
5. Describe osmotic pressure. Why are plant and animal cell affected differently by it? A: When the solute concentration is different, the total water entering or exiting the cell produces a force called osmotic pressure. Animal cells shrink because they only have a cell membrane while plant cells don’t shrink because they have a cell membrane and a cell