Unit 4: Homeostasis and Transport

Write your first and last name in the space below. Watch this video if you need to review the structure and function of the cell membrane. Use the image of the cell membrane to answer the questions that follow. What part of the cell membrane (aka phospholipid bilayer) is hydrophobic? A1 A2 E G What type of molecule is part G (used to transport materials across the membrane)? Carbohydrate Lipid Protein Nucleic Acid The cell membrane is _ because only small and nonpolar materials can cross it easily. selectively permeable a fluid mosaic active homeostatic Watch this video if you need to review passive and active transport. Passive or Active Transport? Observe the concentration gradient in each image below. Use the word bank to label what type of transport is occurring in each image.Word Bank: (spelling is important so you may want to copy and paste from the word bank)passive transport active transport active transport passive transport Passive and Active Transport Classify: Classify each characteristic as passive transport or active transport. Passive Transport Simple Diffusion Osmosis Facilitated Diffusion Does not require energy Moves molecules from high to low concentration (down the gradient) Active Transport Protein Pumps (ex: Sodium-Potassium Pump) Endocytosis Exocytosis ATP energy required Moves molecules from low to high concentration (against the gradient) Name That Type of Transport: Use the word bank to select the appropriate type of cell transport for each image. Simple Diffusion Movement of carbon dioxide and oxygen through the cell membrane from high to low concentration Osmosis Movement of water through an aquaporin channel from high to low concentration Facilitated Diffusion Movement of ions through channel proteins from high to low concentration Sodium-potassium pump Sodium and potassium ions are pumped through a protein against their concentration gradients Endocytosis Uses a vesicle to move large materials INTO the cell Exocytosis Uses a vesicle to move large materials OUT OF the cell Use the diagram below to answer the questions that follow. What type of transport is molecule a using to move across the cell membrane? HINT: look at the concentration gradient Simple Diffusion Facilitated Diffusion Protein Pump Vesicle Transport What type of transport is molecule B using to move across the cell membrane? HINT: look at the concentration gradient Simple Diffusion Facilitated Diffusion Protein Pump Vesicle Transport What type of transport is molecule C using to move across the cell membrane? HINT: look at the concentration gradient Simple Diffusion Facilitated Diffusion Protein Pump Vesicle Transport Molecule D is very large. What type of transport do you think it would need to use to move across the cell membrane? Simple Diffusion Facilitated Diffusion Protein Pump Vesicle Transport Which molecules will need to be transported across the membrane using ATP energy? Molecules A B Molecules A C Molecules B D Molecules C D