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“Practice Scenarios”

Tuesday, January 15, 2013 Wednesday, January 16, 2013. Tuesday, January 15, 2013 Wednesday, January 16, 2013. “Practice Scenarios”. Cell Transport. Cell – the basic unit of all life Semi-permeable – some objects can pass through cell membrane (mostly water) Basic Cell Organelles:

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“Practice Scenarios”

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  1. Tuesday, January 15, 2013 Wednesday, January 16, 2013 Tuesday, January 15, 2013 Wednesday, January 16, 2013 “Practice Scenarios” Cell Transport Cell – the basic unit of all life Semi-permeable – some objects can pass through cell membrane (mostly water) Basic Cell Organelles: Cell Membrane – protects cell/gatekeeper Cytoplasm – fluid inside cell/ helps keep shape Nucleus – typically holds cells genetic material Prokaryotic vs. Eukaryotic Organisms Prokaryotic –single-celled organisms, no nucleus - usually bacteria, not very complex Eukaryotic – multi-cellular organisms, nucleus - usually more complex with more organelles Movement Into and Out of Cells: Diffusion: movement from an area of high concentration to low concentration Osmosis: diffusion of water across a semi-permeable membrane Warm Up: List the three points of the cell theory from your homework last night. Describe the difference between unicellular and multicellular organisms. Homework: Complete the “practice” found on the last notebook page for today Page 81 Page 82

  2. Using Energy to Transport Materials Across the Cell Membrane Two Main Categories: Passive Transport/Diffusion (usually small particles) – Moves substances from areas of high concentration to areas of low concentration Example: Food coloring added to a beaker of water: beforeafter Active Transport (usually larger particles) – Relies on the cell using energy (ATP) to move particles across the membrane Three Categories: 1. Transport Proteins: Special proteins use energy/ATP to pump materials into cell (gatekeeper) 2. Endocytosis: membrane surrounds particles to move them inside (see diagram on next slide) 3. Exocytosis : release of substances from inside vesicles through joining and then releasing from the cell membrane (see diagram on next slide)

  3. Exchanging materials between the cell and its environment Passive Transport Active Transport Transport Proteins use ATP Diffusion Endocytosis (reverse for Exocytosis) Osmosis

  4. Video’s and Examples Passive and Active Transport Animations Endocytosis and Exocytosis Animation

  5. Homework/Practice DIRECTIONS- First Identify if the process is moving materials by active or passive transport. Then determine if the process is diffusion, osmosis, transport proteins, endocytosis, or exocytosis. 1. WATER MOVES OUT OF PLANT LEAF, CAUSING IT TO WILT AND DRY. 2. IF YOU PLACE A TEA BAG IN WATER AND TEA IS MADE. 3. IF FOOD THAT IS TOO LARGE TO ENTER THROUGH THE CELL MEMBRANE IS BROUGHT INTO THE CELL TO KEEP IT FROM DYING. 4. YOU SMELL THE DELICIOUS ODOR OF BAKING COOKIES BEFORE YOU ENTER THE KITCHEN. 5. FRESH WATER MOVES INTO A SINGLE CELLED ORGANISM. 6. A ONE CELLED AMEOBA SURROUNDS A PARTICLE OF FOOD. 7. EXCESS SALT THAT AN IGUANA HAS SOAKED UP IN THE OCEAN IS REMOVED THROUGH THE NOSTRILS. 8. IF A PLANT PUMPS MINERALS FROM THE SOIL TO THE ROOT OF THE PLANT.

  6. Thursday, January 17, 2013 Friday, January 18, 2013 Thursday, January 17, 2013 Friday, January 18, 2013 Organelle Chart Organelle Scavenger Hunt - BYOT Warm –up How are the various jobs in a town or a company divided up among people? Provide examples. Why is it effective to divide the labor in this way? Organelle: – parts of a cell with specific function – structure in the cytoplasm of eukaryotic cell that can act as a storage site, process energy, move materials, or manufacture substances Mini-web quest using www.cellsalive.comwww.biology4kids.com Homework: Create chart of cell organelles and their functions Tell whether the part is in plant, animal, or both cells Page 83 Page 84

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