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Cells Objectives: 1. Learn about the discovery of the cell. 2. Describe the three parts of the cell theory. 3. Compare and contrast eukaryotic and prokaryotic cells. 4. List the parts of the cell and their functions (in class). 5. Describe how a cell is like a factory (in class). Textbook pages 168-173 Think! Think!! Think!! How big is a cell? Is a cell smaller or bigger than an atom? How many cells are in your body? The Size of A Cell Remember that an atom is about the size of a centimeter divided into one million parts. Cells are made of atoms, so cells are larger than atoms. Imagine a centimeter divided into only 10,000 parts. The size of one of those parts is about the size of a cell. There are about 100 trillion atoms (100, 000, 000, 000, 000)in a cell and about 100 trillion cells in your body. Cells Are Amazing! Everything that is alive is made of cells. Cells have many parts. Cells can exist as part of living things, or they can exist on their own as single-celled organisms like the paramecium , amoeba and bacteria. They move, reproduce, eat and swim. Human Cells Your body has over 200 different types of cells. *Red blood cells *Nerve cells *Skin cells *Bone cells The main job of all your cells is to make protein. (!!!!!) Discovery of the Cell Robert Hooke – 1665 Looked at cork, coined the word “cell” (!!!!) Discovery of the Cell Anton van Leeuwenhoek– 1674 Looked at pond water (!!!!!) Your Assignment Create a “Fakebook” page for one of the scientists on pages 170-171. (Hooke, van Leeuewenhoek, Schleide, Schwann, Virchow, or Margulis) Fakebook - http://www.classtools.net/FB/homepage Use tutorial to help you create the page Research the scientist using an internet source Must have image, name, birth date, birth country, and three posts that discuss the scientist’s discoveries Save it and email me the link to your page at [email protected] no later than one week from today. Cell Theory (!!!!!) By the early 1900’s, many scientists had made observations of cells which led to Cell Theory: • All living things are composed of cells. • Cells are the basic unit of structure and function of living things. (The parts inside a cell can not survive on their own, but some cells can.) • New cells are produced only from existing cells. Prokaryotes and Eukaryotes !!!!! Prokaryotes Do not have a nuclear membrane Nuclear membrane – envelope-like covering that holds together the nucleus of the cell Examples are bacteria and some algae Prokaryotes and Eukaryotes Eukaryotes Do have a nuclear membrane Nuclear membrane – envelope-like covering that holds together the nucleus of the cell Examples are humans and plants Parts of the Cell How many parts of the cell can you name without looking it up?