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Transcript
Name _______________________________________________Period_________Date_______________ Cell Membrane Webquest Part 1 “ Cell Membrane" http://www.wisc-online.com/objects/index_tj.asp?objID=AP1101 Step through the animation once to get an overview of a cell membrane. Draw a cell membrane and label all the parts as you step through the animation a second time Part 2 - “ Components of a Cell Membrane" http://www.biologymad.com/cells/cellmembrane.htm 1. Name the three organic compounds that make up the cell membrane. ______________________ ______________________ _____________________ Lipids 2. How are phospholipids arranged? 3. The _______ layer acts as a barrier to __________molecules. 4. Animal cell membranes contain _______________linking the fatty acids together and so stabilizing and strengthening the membrane. 1. Proteins ______________ proteins 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. 3. Proteins 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, catalysing reactions in the cytoplasm. Carbohydrates 1. Where are carbohydrates found in eukaryotic cell membranes? 2. 3. 4. 5. 6. Proteins with carbohydrates attached are called __________________. Phospholipids with carbohydrates attached are called glycolipids. Carbohydrates are short polysaccharides composed of different ____________________ . and form a ________________ outside the cell membrane. What are the functions of the glycocalyx? Name _______________________________________________Period_________Date_______________ Part 3 - 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 Concentration Gradients Solutions Biological Membranes Scroll down to example #1 (how perfume spreads throughout a room) and read it. Next scroll down to example #2 (salt dissolving in water) and read it. 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. Name _______________________________________________Period_________Date_______________ Part 4 Osmosis http://www.biologycorner.com/bio1/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? 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 5 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 cell in the last unit what is the energy molecule that would be needed to carry out phagocytosis? ___________________________________ 4. What organelle do you think digests the incoming particle? __________________________