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SCIENCE 8 LIFE SCIENCE: CELLS AND SYSTEMS The Cell Theory: When Schleiden and Schwann proposed the cell theory in 1838, cell biology research was forever changed. The cell theory states that: 1. All life forms are made from one or more cells. 2. Cells only arise from pre-existing cells. 3. The cell is the smallest form of life. The cell theory also provides us with an operational definition of "life." 1655: Robert Hooke observes cells of a cork tree through a primitive microscope. Leewenhoek discovers Protozoa (1674 ) and Bacteria (1683). • Prokaryotic vs eukaryotic handout: Students turn to page 32 and read the section at the bottom of the page. Do Activity 1-5 on page 33 WHAT TO DO steps 1 and 2. Do not do the WHAT DID YOU FIND OUT questions. Hand in your Venn Diagram • WORKBOOK 1.2 page 12 ( animal vs. plant and prokaryotic vs eukaryotic), and page 13 (overall review) TEXTBOOK HW: • • • Read page 33 on Bacteria and take point form notes Read page 34 on Viruses and take point form notes Page 38 three questions on stem cells