Gen Bio1 (Lesson 1).pptx

Duration: 55 Senior High School Grade 12 GAS/ min STEM Welcome to General Biology 1 Class (Grade 12)  Duration: 55 Senior High School Grade 12 GAS/ min STEM MELCS: Explain the postul...

Duration: 55 Senior High School Grade 12 GAS/ min STEM Welcome to General Biology 1 Class (Grade 12)  Duration: 55 Senior High School Grade 12 GAS/ min STEM MELCS: Explain the postulates of the cell theory Specific Objectives: 1.Enumerate and explain the postulates of the cell theory 2.Compare and contrast cheek (animal) cells with onion (plant) cell Lesson overview Every single structure in the living world is categorized in hierarchical levels. The cellular level serves to be the lowest in this level. Basically, cell is the fundamental structural unit of life. All living things are made up of cell. Each of which is about five thousandth of a millimeter. Extremely little, that cannot be seen by the naked eye. Despite of its miniscule size, cells are responsible for all the minor and major functioning of all living organism. Standards Our understanding of nature often goes hand in hand with the invention and refinement of instruments that extend human senses. Lesson overview Before microscopes were first used in the 17 century, no one knew th that living organisms were composed of cells. The first microscopes are like the ones you use in the laboratory. Around 1590, Zacharias Janssen invented the first compound microscope. It was believed that Zacharias probably had help from his father, Hans, because he was still young back then. Standards They made this microscope by placing several lenses together and discovered that objects were further enlarged upon viewing. The visible light is passed through a specimen, and through glass lenses. The lenses bend the light in a manner that the image is enhanced. Testing Prior Knowledge Have you tried to look closely to something? Imagine you are getting an egg from your kitchen. Closely look and examine the egg. Such curiosity lead early scientists in the discovery of the cell Comparison and Contrast: Structurally, how does an egg look like a cell?  Unveiling History Explore Objective: Enumerate and Explain the postulates of cell theory Standards Procedure: Study the timeline and analyze the conceptualization of cell theory  Unveiling History Explore Guide Questions: Objective: Enumerate and 1.From the timeline presented, what three Explain the statements best describe cell theory? postulates of cell Explain each postulate. theory Procedure: Standards Study 2.How did the invention of microscope the timeline and contribute to the discovery of cells? analyze the conceptualization 3.If the above scientists did not pursue of cell theory their works and shared their contributions to the world, do you think the idea that “ all organisms are made  Unveiling History Explore Watch the video clip entitled: The History of the cell theory. Do take down notes for the important details Videoclip link: https://www.youtube.com/watch?v=NHLK 6vWMS1c  Explain Scientists Behind Cell Theory 1.Robert Hooke- He coined the Standards word CELL to describe these chamber-like structures and later became famous. - He thought that only plants and fungi were the only  Explain Scientists Behind Cell Theory 2. Anton van Leeuwenhoek- Published his observations on tiny living Standards organisms which he named animalcules. It was believed that he was the first to observe under his microscope the structure of a red blood cell of different animals as well as a sperm cell.  Explain Scientists Behind Cell 3. Robert Brown- was able to Theory compare diverse kinds of plant specimens Standards under the microscope. He markedly indicated that there is one common thing about them– they are all composed of cells, and inside the cell is a dark  Explain Scientists Behind Cell Theory 4. Matthias Schleiden- concluded Standards that all plant parts are made of cells.  Explain Scientists Behind Cell Theory 5. Theodor Schwann- stated Standards that all animal tissues are composed of cells  Explain Scientists Behind Cell Theory 6. Rudolf Virchow- concluded Standards that all cells come from pre-existing cells.  Explain Postulates of a CELL THEORY 1.All living organisms are composed of one or more cells Standards 2.The cell is the basic unit of life in all living things 3.All cells come from pre-existing cells  Elaborate Postulates of a CELL THEORY 1.All living organisms are composed of one or more cells 2.The cell is the basic unit of life in all living things Standards The three 3.All cells comepostulates of cells from pre-existing the cell theory offer the basis on how an object is considered a living thing. Briefly explain the three postulates based on the given information. You may use the idea/s in our discussion a while  Expand Assignment Watch this video clip: Video clip link: https://www.youtube.com/watch?v=wMgXsrpVrJg 1.Based on the video clip what have you observed in animal cell? Plant cell? 2.Differentiate animal from plant cell Bring the following: 1. Transparent jar (wide mouthed bottled water), unflavored gulaman, flashlight. 2. Bond paper and pencil (with eraser/ sharpener)