Cell lab

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This is a PowerPoint that I show to my biology classes before I have them do their first biology lab on plant and animal cells

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Cell lab

  1. 1. Biology 3 CELL LAB
  2. 2. Discovery of Cells and the Development of Cell Theory •The study of cells started about 330 years ago. oBefore that time cells escaped notice because of their small size. oWith the invention of the microscope, cells became visible and many new discoveries were made about them. oEven today the study of cells reveals more detail, and its secrets, which are in fact the secrets of life itself.
  3. 3. Early Pioneers of Cell Biology •1665: English Scientist and Microscopist Robert Hooke described a honeycomb-like network of cellulae (Latin for little storage rooms) in cork
  4. 4. •Antonie van Leeuwenhoek (16321723) described cells in a drop of pond water using a microscope. oFirst person to observe bacteria and protozoa. oSome of his lenses could magnify objects 250X.
  5. 5. The cell is the basic unit of life. •1838: Matthias Jakob Schleiden, a German botanist, concluded that all plant tissues are composed of cells and that an embryonic plant arose from a single cell. •1839: Theodor Schwann, a German biologist, reached the same conclusion as Schleiden about animal tissue being composed of cells.
  6. 6. Cork Cells Cork Cells viewed with a compound light microscope @ 400x Scanning electron micrograph of cork cells
  7. 7. Red Onion Epidermal cells
  8. 8. Elodea Cells Elodea cells at 400X
  9. 9. Human Cheek Cells
  10. 10. Study Questions •1. Is the cell wall living or dead? •2. Describe three ways that a plant cell differs from an animal cell. •3. List 3 structures that are associated with both prokaryotic and eukaryotic cells. •Why do we stain specimens? •Why must the specimen you observe be very thin?
  11. 11. Cell Lab Directions •1. Make labeled drawings of the cork cells, onion cells, and your cheek cells at 400x. oFor the cork cells label the cell walls and lumen (space inside the cell wall of each cell). oFor the onion cells label the cell wall, cytoplasm, and central vacuole. If you observe and draw a nucleus label that too. oFor the cheek cells label the cell membrane, cytoplasm and nucleus.
  12. 12. •Make all drawings at least ¼ the size of the page. The title and magnification used for the drawing goes below the drawing.

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