Haveouts Guided Notes Pen/pencil CAV Card DFAD
Do First: Answer in your DFAD Answer the questions are in your Guided Notes, be sure to record your answers in your DFAD. You have 5 mins. Haveouts Guided Notes Pen/pencil CAV Card
Grades will be posted this Friday. Deadline to retake Quiz #12 Parts of a Cell is THIS Friday. After Friday, you can NOT retake Quiz #12. (I am even giving a one day extension.) You have until February 6 th to retake Quiz #13. Tutorials will be held afterschool today.
Why? We have learned that the plasma membrane regulates what is able to pass through and what cannot. But how do molecules know when to pass through and which direction to go? We need to know how the cell regulates what goes in and what goes out of the cell.
Plasma/Cell Membrane regulates what is able to pass through and what cannot.
The Plasma Membrane Maintains homeostasis: Homeostasis - regulate internal conditions by monitoring the entrance and exit of different molecules and nutrients.
What is the Plasma Membrane like? In this example, think about what will most likely happen to the salsa as it passes through the various kitchen items. What is permeability? What would being party permeable mean? Your voice should be off and tracking the speaker (Mr. Fitz)
Permeable a membrane that allows the passage of all substances regardless of their size or shape.
Semi-permeable a membrane that allows the passage of some molecules, depending on their size and shape.
How it looks in a cell
Impermeable a membrane that does NOT allow the passage of any molecule, regardless of their size and shape.
Where will these people most likely move to? High Concentration of people on a bus Low Concentration of people on a bus
In your notes Beside Concentration Gradient add With CG is High to Low Against CG is Low to High High Concentration: Lots of molecules crowded together Low Concentration: Not very many molecules Concentration Gradient: A difference in concentration inside and outside of the cell
Does not require energy From HIGH to LOW Diffusion Facilitated Diffusion
Diffusion the random movement of particles from a high concentration (a lot of them) to a low concentration (spread out).
Facilitated Diffusion proteins help diffusion happen! Usually the molecules are too big to cross membrane on their own
CFU #1: What type of transport is the Grey molecule undergoing? Answer this CFU in the box on the bottom right side of your handout.
CFU #2: Yellow molecule is TOO BIG to pass through the cell membrane. What type of transport must it undergo? Answer this CFU in the box on the bottom right side of your handout.
CFU: Diffusion and Permeability Turn and Talk Work with a partner to answer each of the 3 questions 1. Which molecule is diffusing across the membrane? 2. Why isn t the other one crossing? 3. Is this facilitated diffusion? Why or why not?
Key points Every cell is covered by a membrane that controls what can enter and leave the cell. Most membranes are semi-permeable: they allow only some molecules to enter/leave the cell Passive transport does not require energy because molecules are moving from an area of high concentration to low concentration
Independent Practice Answer questions all question starting at Independent Practice Work must be done silently and independently. No Talking. If you have a question or request raise a silent hand and be patient. For independent practice, today we will be working silently and independently for 6 minutes.
Group Practice Review the questions answered during Independent practice. Go over each question. Each table member should explain why they selected their answer. Work must be done at a level ONE volume, which means I should not be able to hear you from my desk. Remain in your seat and only talk to people at your table. Make sure to keep conversations on topic. If you have a question or request raise a silent hand and be patient. For group practice, today we will be working for 10 minutes.