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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:
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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