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Essential Question: How do cells differ among living organisms? Agenda: 1. Practice Selected Response Question 2. View examples of cells 3. What makes a cell a cell? 4. Prokaryotic vs. Eukaryotic cells Gibberellic Acid (GA) is a hormone that affects the growth of plants. A Student predicted that the spraying gibberellic acid solution on corn plants would increase their rate of growth. To test this hypothesis, he planted a corn plant and sprayed the same amount of gibberellic acid solution on it every day for one week. At the end of the week, he found that the corn plant had grown seven centimeters. Based on this observation, he concluded that gibberellic acid had caused the plant to grow faster What would gibberelic acid be considered in this experiment? A. Experimental Group B. Independent Variable C. Control Group D. Dependent Variable Gibberellic Acid (GA) is a hormone that affects the growth of plants. A Student predicted that the spraying gibberellic acid solution on corn plants would increase their rate of growth. To test this hypothesis, he planted a corn plant and sprayed the same amount of gibberellic acid solution on it every day for one week. At the end of the week, he found that the corn plant had grown seven centimeters. Based on this observation, he concluded that gibberellic acid had caused the plant to grow faster What is missing in this experiment? A. Experimental Group B. Independent Variable C. Control Group D. Dependent Variable Centric Diatom (Protista Kingdom ) Bread Yeast (Fungi Kingdom) Golden Colonial Algae (Protista Kingdom) Plant leaf stomata (Plantae Kingdom) Sunflower petal with pollen grains (Plantae Kingdom) Human Breast Cancer Cells (Kingdom Animalia) Cells pre-assessment Plants and animals do have many characteristics in common http://www.kathimitchell.com/cells.html Halophiles (left) love salty conditions that easily kill other organisms Thermophiles (right) love very hot conditions that easily kill other Cell Theory The basis of this theory is that all life is made of cells. Could life exist without cells? Its “just a theory” (like the atom or gravity). What does this mean? Lily Cell Human Liver Cell (Kingdom Plantae) (Kingdom Animalia) Some cells have structures that allow them to move Even human cells can MOVE! Prokaryotes do not have a nucleus Proprionibacterium acnes The eubacteria which causes acne is a single celled organism. Human red blood cells, platelets, and white blood cells (Animalia Kingdom) Acetabularia is very big and you can see it without a microscope But Acetabularia is still a singlecelled organism. What makes a cell a cell?