Cells - Overdrawing a Cell Micrograph

  • Topics
  • Scientific Visualization Objectives
  • Biology Objectives
  • Tools
  • Teacher Background
  • References
  •  Student Assignment
  • Evaluation Criteria
  • Purpose:  To overdraw a cell micrograph in order to create an effective diagram.

    Overview:  Students will learn to use a drawing program to create a diagram from a photo or micrograph.


        Scientific Visualization:  Drawing - Software techniques
        Biology - Cells

    NC Scientific and Technical Visualization Objectives:

    4.05 Describe visual methods for representing concept-driven visualizations

    NC  Biology  Goals and Objectives

    1.02  Describe the structure and function of cell organelles.

       Optional Extensions:  Cameras,  variety of lenses,  Microscopes with video or camera attachment, scanner.

    Teacher Background

    Students can use this technique to make diagrams from photographs or micrographs they take or find.  Diagrams are often simpler to read and interpret than photographs of complex natural biological and geological features.  Diagrams are also used as a sidebar or overlay to label photographs.  Students can find and scan appropriate photos and photomicrographs from textbooks and journals, they can locate and download useful micrographs on the web, or if your school has the equipment, they can take their own.   Suitable subjects include cells, dissections, plants, geological layers exposed in roadside cuts, ariel photos...
    A clickable animal cell is located at   http://www.libfind.unl.edu/wglider/tutorial/animcell.html    This will help you to identify the cell organelles.

    Here are some Corel Draw tools you  will need to complete this lesson:

    Student Assignment Sheet
    1.  Choose your own cell micrograph and scan it in to your computer or download the cell micrograph provided - click on the link and save it to your space.  Cell micrograph
    2.  Open CorelDraw from the Start Menu (don't double-click on the file you just copied, this will open PhotoPaint, a different package).
    3. Import the cell micrograph you downloaded.  Use File>Import.   Then click the image into the upper left corner.
    4.  Without distorting the image pull on the lower right corner to enlarge the image to the paper length.  Leave room on the right hand side for labels.
    5. Select the whole image and scoot it down the page so there is room for a title at the top.
    6.   Save the image with a new name so that you can go back to it at any time.
    7. Create a new layer for your diagram by clicking the new layer icon or the right arrow  located at the top of the object manager.    You may want to experiment with changing layers and turning layer features on and off.
    8. Select the text tool - then select a font style and size.
    9. Type your name in the upper right of the paper using a small font.
    10. Switch to a larger font and type the title in the top center of the page.
    11. Use the Bezier tool (you may have to pullout the freehand tool to find this tool)  to outline the edge of a mitochondria.  Use a slight drag with each click so that handles are created.  Later you can  use the handles to manipulate the shape.  Be sure to close the shape by making your final click on your start point.
    12. Use the fill tool to fill the mitochondrondria.
    13. Use the transparency tool to adjust  the transparency as needed.
    14. Outline at least the cell and nuclear membranes and six organelles of at least two different types ( nucleolus, mitochondria, transport vesicles, endoplasmic reticulum, etc.  Use the clickable animal cell at http://www.libfind.unl.edu/wglider/tutorial/animcell.html to help you identify cell parts. )  You may choose which organelles it is helpful to fill.  Each different part should be coded by using a different color.  Label using a leader line and a name. 
    15. Save your cell diagram.
    16. Print, with and without the underlying micrograph.

    Evaluation Criteria
    cell and nuclear membrane outlined 12
    6 organelles outlined  12
    use of fill  8
    use of transparency 8
    straight leader lines 5
    cell parts labeled 10
    use of color 10
    use of fonts 10
    overall appearance 10
    file properly saved 5
    printed with background micrograph 5
    print without background micrograph 5
    Total 100

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    eeh 6/23/00