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 Homework: Type the following sections of the Diffusion Lab: Background Info Purpose/Hypothesis Summary of Procedure  Do Now: (in your notebook)  What.

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Presentation on theme: " Homework: Type the following sections of the Diffusion Lab: Background Info Purpose/Hypothesis Summary of Procedure  Do Now: (in your notebook)  What."— Presentation transcript:

1  Homework: Type the following sections of the Diffusion Lab: Background Info Purpose/Hypothesis Summary of Procedure  Do Now: (in your notebook)  What is happening to the dye in the water? Based on your reading, what is this called?  Today’s Objectives:  Design an experiment to test diffusion of starch and glucose across a membrane  Use scientific vocabulary to explain how a cell membrane controls what enters and leaves a cell Bio 9C: Thursday, Title: Movement Across Cell Membranes – Day 2

2 MOVEMENT ACROSS CELL MEMBRANES Moretti and Dickson

3 Class Discussion:  Starch  How do we test for it?  Use Iodine  How do we know starch has passed through membrane?  Iodine outside the dialysis bag turns from yellow-orange to purplish- brown  Glucose  How do we test for it? Boil it in Benedicts solution or use a glucose test strip  How do we know glucose has passed through the membrane? Glucose test strip will change color Designing a Lab: Diffusion Across Cell Membranes Objectives for Class:  Design an experiment by drawing from your knowledge of starch, glucose, cell membranes, and experimental indicators that test for the presence of starch and glucose.

4 Review Experimental Set-Up:  Part I:  Set-up Dialysis Bag  Moisten tube and tie one end  Add the starch & glucose solution to the tube  Tie the top of the tube  Rinse w/ tap water to wash excess solution from outside of bag  Set-up Beaker  Fill a 250 ml beaker ¾ of the way with water  Add Iodine to water – mixture should be orange-ish  Put dialysis bag into beaker with water and iodine  Part II: Wait 30 min to allow for substances to move across the membrane Designing a Lab: Diffusion Across Cell Membranes Water and Iodine Objectives for Class:  Design an experiment by drawing from your knowledge of starch, glucose, cell membranes, and experimental indicators that test for the presence of starch and glucose. Starch & Glucose Solution

5 Review Experimental Set-Up:  Part III:  How do you know the following substances have left the bag:  Starch?  Glucose?  What other substances might move across the bag? How will you know? Designing a Lab: Diffusion Across Cell Membranes Objectives for Class:  Design an experiment by drawing from your knowledge of starch, glucose, cell membranes, and experimental indicators that test for the presence of starch and glucose. Water and Iodine Starch & Glucose Solution

6  Lipid Bilayer  Two layers of lipids that form the outer membrane of a cell. Flexible Strong Do not Dissolve in water New Vocabulary Objectives for Class:  Use scientific vocabulary to explain how a cell membrane controls what enters and leaves a cell Image to the right shows the lipid bilayer of a cell. Notice how it has other components like protein channels & “pumps” built into it. zoom out

7  Selective Permeability  When a cell membrane (or any membrane for that matter) only allows certain materials to pass across the membrane and not others  Substance usually pass across based on the size, shape, and charge (+/-/neutral) of the molecules New Vocabulary Objectives for Class:  Use scientific vocabulary to explain how a cell membrane controls what enters and leaves a cell

8  Homework: Type the following sections of the Diffusion Lab: Data/ Results Analysis Conclusion Bring in a printed copy of your background information section to class Monday!!!!  Do Now:  Clear your desks except for lab notebook and the Diffusion Lab Set-up Sheet.  Today’s Objectives:  Implement an experiment to test diffusion of starch and glucose across a membrane  Use scientific vocabulary to explain how a cell membrane controls what enters and leaves a cell Bio 9C: Friday, Title: Movement Across Cell Membranes – Day 3

9 Review Experimental Set-Up:  Part I:  Preparing Dialysis Bag  Soak the dialysis tube in water to soften  Tie one end into a knot  Fill the tube about half-way w/ starch/ glucose solution  Tie the other end of the tube into a knot to seal the bag  Rinse w/ tap water to wash excess solution from outside of bag  Preparing the Beaker  Label your beaker  Fill a 140 ml beaker ¾ of the way with water  Add drops of Iodine to water and mix. Note the color of the water  Test water with glucose test strip and note any color change  Preparing the Model:  Put dialysis bag into beaker with water and iodine solution  Part II:  Wait 30 min to allow for substances to move across the membrane  Part III:  Data Collection Diagram the experimental set-up Create a data table to collect data in your notebooks Collect data by recording any color change to the beaker, dialysis bag, and/or glucose test strip. (note: we will finish out notes before you record the data into your table) zz Implementing the Lab: Diffusion Across Cell Membranes Water and Iodine Objectives for Class: Implement an experiment to test diffusion of starch and glucose across a membrane Starch & Glucose Solution

10  Concentration  How much “stuff” is in a given amount of liquid  Mass of a solute (stuff in the liquid) per a given volume of the total solution  i.e.: 12g of salt in 3L of water = 12g/3L = 4g/L  Diffusion  Movement of molecules from a high concentration (more stuff) to low concentration (less stuff)  Osmosis  Movement of water through a selectively permeable membrane from a high concentration to low concentration Note: For osmosis to occur, the membrane only allows water to pass across and not the solute New Vocabulary Objectives for Class:  Use scientific vocabulary to explain how a cell membrane controls what enters and leaves a cell Diffusion Osmosis

11 Review Experimental Set-Up:  Part I:  Preparing Dialysis Bag  Soak the dialysis tube in water to soften  Tie one end into a knot  Fill the tube about half-way w/ starch/ glucose solution  Tie the other end of the tube into a knot to seal the bag  Rinse w/ tap water to wash excess solution from outside of bag  Preparing the Beaker  Label your beaker  Fill a 140 ml beaker ¾ of the way with water  Add drops of Iodine to water and mix. Note the color of the water  Test water with glucose test strip and note any color change  Preparing the Model:  Put dialysis bag into beaker with water and iodine solution  Part II:  Wait 30 min to allow for substances to move across the membrane  Part III:  Data Collection Diagram the experimental set-up Create a data table to collect data Collect data by recording any color change to the beaker, dialysis bag, and/or glucose test strip. Implementing the Lab: Diffusion Across Cell Membranes Water and Iodine Objectives for Class: Implement an experiment to test diffusion of starch and glucose across a membrane Starch & Glucose Solution

12 Implementing the Lab: Diffusion Across Cell Membranes Objectives for Class: Implement an experiment to test diffusion of starch and glucose across a membrane Background Information Brainstorm Diffusion Cell membrane Selective permiability Dialisis tubing and why using it Glucose test strip and iodine=indicators Osmosis? Concentration Glucose and starch what are they Monosacharide and disacheride Structure

13  Homework: Typed Final Draft of the Diffusion Lab Due Wednesday at the start of Class  Do Now:  Take out the lab report you are writing. Which molecules moved across the dialysis bag membrane? Why?  Today’s Objectives:  Use scientific vocabulary to explain how a cell membrane controls what enters and leaves a cell  Make clear connections between various vocabulary words and concepts to each other and to the purpose of the lab, so as to write a better Background Information Section. Bio 9C: Monday, Title: Movement Across Cell Membranes – Day 4

14 Diffusion, Osmosis and Selective Permeability In Action: New Vocabulary Objectives for Class:  Use scientific vocabulary to explain how a cell membrane controls what enters and leaves a cell

15 Wrapping up the Lab: Diffusion Across Cell Membranes Objectives for Class: Use scientific vocabulary to explain how a cell membrane controls what enters and leaves a cell Make clear connections between various vocabulary words and concepts to each other and to the purpose of the lab, so as to write a better Background Information Section. Writing Better Background Information Sections Task I: Read the to example Background Information sections from the Denatured Enzyme Lab and grade them according to the rubric.

16 Wrapping up the Lab: Diffusion Across Cell Membranes Writing Better Background Information Sections Task II: Create a mind-map to connect the vocabulary and concepts for the Background Information Section. This will help us outline this section for us as well. Objectives for Class: Use scientific vocabulary to explain how a cell membrane controls what enters and leaves a cell Make clear connections between various vocabulary words and concepts to each other and to the purpose of the lab, so as to write a better Background Information Section.

17 Implementing the Lab: Diffusion Across Cell Membranes Objectives for Class: Implement an experiment to test diffusion of starch and glucose across a membrane Background Information Brainstorm Cell membrane (lipid bilayer) Selective permeability Diffusion Concentration Dialysis tubing and why using it Glucose and starch what are they and their structures (Monosaccharide and disaccharide) Glucose test strip and iodine=indicators Osmosis? (optional)

18 Wrapping up the Lab: Diffusion Across Cell Membranes Writing Better Background Information Sections Task III: Use mind-map/ outline to re-write your background information section more effectively. Objectives for Class: Use scientific vocabulary to explain how a cell membrane controls what enters and leaves a cell Make clear connections between various vocabulary words and concepts to each other and to the purpose of the lab, so as to write a better Background Information Section.

19  Homework: Read pages in the Biology textbook (this is the first half of section 37-3). In your notebook: Take notes based on the questions on the back of Assign. sheet.  Do Now:  Pass Lab Reports with stapled rubrics to the middle of the row.  Today’s Objectives:  Use scientific vocabulary to explain how a cell membrane controls what enters and leaves a cell Bio 9C: Wednesday, Title: Movement Across Cell Membranes – Day 5 Double Block

20 Today’s Agenda Finish reviewing Cell Membrane vocabulary Work in pairs to complete the Cell Membrane MCAS Questions Finding Patterns in Nature: Biomimicry and the Respiratory System Begin Respiratory System Notes Begin Respiratory System Homework Objectives for Class: Use scientific vocabulary to explain how a cell membrane controls what enters and leaves a cell

21  Facilitated Diffusion  When a substance diffuses through a membrane by going through a protein channel  Regular diffusion goes through the lipid bilayer New Vocabulary Objectives for Class:  Use scientific vocabulary to explain how a cell membrane controls what enters and leaves a cell Protein Channel

22  Active Transport  When a substance is pumped across a membrane from where there’s a low concentration (less stuff) to where there’s a high concentration (more stuff)  Requires a pump (made of protein) and ATP energy! New Vocabulary Objectives for Class:  Use scientific vocabulary to explain how a cell membrane controls what enters and leaves a cell

23 MCAS Question Practice Work in pairs to complete Cell Membrane MCAS review Questions Objectives for Class: Use scientific vocabulary to explain how a cell membrane controls what enters and leaves a cell

24 Transition to Biomimicry Activity..\Human Physiology\Internal Transport\PHA_Bio9_respiratory_biomimmicry.ppt..\Human Physiology\Internal Transport\PHA_Bio9_respiratory_biomimmicry.ppt Objectives for Class: Use scientific vocabulary to explain how a cell membrane controls what enters and leaves a cell


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