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Transcript
1 Name:_____________________________________ Period: 1 2 3 4 5 6 7 8 9 Cell Membrane Webquest Part 1-Go to Mr. Downs’s Website (SOTA, teacher, Downs). Use my website and use the calendar to answer the following questions: 1). We have ____________school days off for the Thanksgiving Holiday. 2). The next lab we will be doing in class is the ____________________________________Lab. 3.) The file for this Internet activity is located in “Files and Forms”. You may find it easier to copy and paste the addresses from the blank form instead of typing each one in. Part 2 - “ Components of a Cell Membrane" http://www.biologymad.com/cells/cellmembrane.htm 1. Cell Membranes are made up of. ______________________ ______________________ _____________________ Lipids 2. How are phospholipids arranged?____________________________________________________________ 3. The _______ layer acts as a barrier to all but the __________molecules. 4. Animal cell membranes contain _______________linking the fatty acids together and so stabilizing and strengthening the membrane. Proteins 1. ______________ usually span from one side of the phospholipid bilayer to the other (integral proteins) 2______________ proteins sit on one the surfaces of the cell membrane. 3Proteins comprise about ______ of the mass of membranes, and are responsible for most of the membrane's properties. 4_______________ proteins that span the membrane are usually involved in transporting substances across the membrane. 5________________proteins are often attached to the cytoskeleton and are involved in maintaining the cell's shape, or in cell motility. They may also be enzymes, catalyzing reactions in the cytoplasm. Carbohydrates 1. Where are carbohydrates found in eukaryotic cell membranes?_________________________________ ______________________________________________________________________________________ 2. Proteins with carbohydrates attached are called __________________. 3. Phospholipids with carbohydrates attached are called _____________________________. 4. Carbohydrates are short polysaccharides composed of different ____________________ . 5. and form a ________________ outside the cell membrane. 6. What are the functions of the glycocalyx? ________________________________________________ 2 ___________________________________________________________________________________ Part 3 “ Cell Membrane" http://www.wisc-online.com/objects/index_tj.asp?objID=AP1101 1. Step through the animation once to get an overview of a cell membrane. If you have earbuds, you can plug it in and listen to the animation 2. Draw a cell membrane and label all the parts as you step through the animation a second time. Read each slide as you will be taking a practice quiz to see what you have learned. 3. Take the practice quiz beginning on slide 23. You will given multiple opportunities to answer the question until you get it right. 4. How many question did you get right the first time?________ second time?__________ Part 4 - Diffusion and Osmosis http://www.mun.ca/biology/Osmosis_Diffusion/tutor2.html 1. Read the overview and define all the terms Diffusion-_________________________________________________________________________________ Osmosis –_________________________________________________________________________________ Passive Transport -__________________________________________________________________________ Thermal Motion -___________________________________________________________________________ Hypertonic-________________________________________________________________________________ Hypotonic-________________________________________________________________________________ Isotonic-__________________________________________________________________________________ Concentration Gradients -_____________________________________________________________________ Solutions -_________________________________________________________________________________ Sovent-___________________________________________________________________________________ Biological Membranes -______________________________________________________________________ Scroll down to example #1 (how perfume spreads throughout a room) and read it. Summarize what you read: 3 __________________________________________________________________________________________ __________________________________________________________________________________________ Next scroll down to example #2 (salt dissolving in water) and read it. Summarize what you read: __________ __________________________________________________________________________________________ __________________________________________________________________________________________ Next scroll down to example #3 (diffusion will occur through a permeable membrane) 2. What is the solute concentration in side A? ____________________________________ What is the solvent concentration in side A? ____________________________________ 3. What is the solute concentration in side B? _____________________________________ What is the solvent concentration in side B? ____________________________________ 4. Draw a diagram of the two sides (A and B) and show the movement of solute and solvent across the permeable membrane. Label the concentrations of solute and solvent under both sides. Part 5- Osmosis http://www.biologycorner.com/bio1/notes_diffusion.html 1. What is equilibrium? __________________________________________________________________ 2. What is a selectively permeable membrane?________________________________________________ ____________________________________________________________________________________ 3. What is Osmosis? _______________________________________ 4. An isotonic solution has the _____________ concentration of _______________ as another solution like the cytoplasm of the cell. Which way does the water move? ________________________________ What happens to a cell when it is placed in an isotonic solution? _____________ What does iso mean?____________________________ 5. What does hypo mean?___________________________ A hypotonic solution has a _________________concentration of _______________ relative to another solution like the cytoplasm of the cell. What happens to a cell when it is placed in a hypotonic solution? 4 Which way does the water move? ___________________________ What happens to the cell? _________________________________ 6. What does hyper mean?___________________________ A hypertonic solution has a _______concentration of _________ relative to another solution like the cytoplasm of the cell What happens to a cell when it is placed in a hypertonic solution? Which way does the water move? _____________________________ What happens to the cell? __________________________________ Part 6 Phagocytosis http://www.stolaf.edu/people/giannini/flashanimat/cellstructures/phagocitosis.swf Run the animation of phagocytosis. 1. Phagocytosis involves bringing a large particle into the cell. Rerun the animation and describe the process? Draw a diagram to help with your explanation ___________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ _____________________________________ 2. Do you think this activity would require energy? _________ 3. From your knowledge of the cells and mitochondria, what is the energy molecule called that would be needed to carry out phagocytosis? ___________________________________ . Part 7 -Quiz http://www.biologycorner.com/quiz/qz_diffusion.html Score: _____ Part 8-Read Study Guide: http://www.biologycorner.com/worksheets/diffusion_osmosis_review.html What organelle do you think digests the incoming particle? __________________________