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History of the Cell Anton von Leeuwenhoek (in Holland) Mid 1600’s

History of the Cell. History of the Cell Anton von Leeuwenhoek (in Holland) Mid 1600’s Used single lens microscope to look at water, and noticed tiny “animalcules” in it! Robert Hooke (in England) Mid 1600’s Looked at cork (from the bark of an oak tree) under a compound microscope.

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History of the Cell Anton von Leeuwenhoek (in Holland) Mid 1600’s

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  1. History of the Cell • History of the Cell • Anton von Leeuwenhoek (in Holland) • Mid 1600’s • Used single lens microscope to look at water, and noticed tiny “animalcules” in it! • Robert Hooke (in England) • Mid 1600’s • Looked at cork (from the bark of an oak tree) under a compound microscope. • Magnified cork looked like tons of tiny chambers. Called them cells.

  2. History of the Cell • Matthias Schleiden • 1838 – concluded all plants were made of cells • Theodor Schwann • 1839 – stated all animals were made of cells • Rudolf Virchow • 1855 – new cells can only be produced from existing cells

  3. Cell Theory • Cell Theory • All living things are composed of cells. • Cells are the basic units of structure and function in living things. • New cells are produced from existing cells.

  4. 4.6

  5. Types of Cells Prokaryotic Eukaryotic All Cells • Genetic material contained in a nucleus. • Genetic material not in a nucleus • Bound by a plasma/cell membrane • Generally larger and more complex • Generally smaller & simpler • Have DNA • Contain dozens of specialized structures • Have ribosomes • Ex/ bacteria • Ex/ plant and animal

  6. Prokaryotic Cells

  7. Eukaryotic Cells

  8. Cell Analogy Poster A major part of this unit is learning the parts of the cell and their functions. In this project you will demonstrate understanding of the cell by making an analogy of the cell, taking each organelle and function into consideration. • Instructions: • You will work in groups of 3. • You will display your project as a poster. • Your poster must have drawings for your scenario which show your analogy, and a written explanation for each organelle. • You MUST include 10 organelles.

  9. Cell Analogy Poster • Grading: 30 points • 10 points for your IDEA. It will be judged on creativeness, originality thoughtfulness. • 10 points for your poster. Poster must include correct analogies for structure/function of cell organelles. • 10 points for presentation.

  10. October 14th • Warm-up • Quick review of cell structures. • 20 minutes to finish cell analogy posters. • We will begin poster presentations afterwards! • Objectives  • Finish cell analogy poster presentations. • Observe cell specimens under the microscope. • Homework  • Honors : Cell History, Structure and Function Test Friday.

  11. Cell Theory Lab • You will be observing: • Cork Cells  Just like Robert Hooke! • Animal Cells • Cheek Cells • Plant Cells • Onion • Elodea • Potato • Tomato • Beet

  12. How to Make a Wet Mount Slide

  13. The Toweling method Drop of stain (iodine) Paper towel square

  14. Cell Theory Lab • You will be observing: • Cork Cells  Just like Robert Hooke! • Animal Cells • Cheek Cells • Plant Cells • Onion • Elodea • Potato • Tomato • Beet

  15. Continue Cell Theory Lab

  16. Cork cells • Are the cells similar in shape? • Are they similar in size? • Do the cells appear to have contents? • Explain? • Are their open spaces between the cells?

  17. Epithelial cells • What is the outer most layer called? • Compare it with the cell wall in plants. • Does the cell have a definite shape? • If so, what is its shape? • Is a central vacuole present? • Can you see the cytoplasm?

  18. Epithelial cells Plasma membrane Nucleus Cytoplasm

  19. Onion Cell

  20. Elodea (Anacharis)

  21. Potato Cell

  22. Tomato

  23. Beet

  24. Organization of Life

  25. Organization of Life Tissues of Life online activity.

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