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WebLab#2: Exercise#2
Discovering Organelles
Objectives: |
- To explain the difference in the interior design of eucaryotic and procaryotic cells.
- To describe the work of a cell as a product of the division of labor of the cell's organelles.
- To explain the importance of dyes and electron microscopy in the gradual unfolding of the presence and role of the cell's organelles.
- To prepare a poster, for submission in class, illustrating and labeling the organelles found in typical animal, plant and bacterial cells.
- To write concise descriptions of the basic functions of each of the organelles illustrated in the poster previously prepared. These descriptions are to be written on the back of the poster.
- To concisely describe the following five cellular activites:
diffusion, osmosis, active transport, phagocytosis, and pinocytosis.
These descriptions are to be submitted through email to your professor.
Comments and grades for these descriptions will be sent back to
you through email by your professor.
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- A computer, internet service provider (ISP), and a recent version browser (e.g., Microsoft Internet Explorer 5.0 or later, Netscape Navigator 4.0 or later). By connecting to Microsoft's home page, or Netscape's home page, you can access the latest versions of these popular browsers. (Note: at Netscape's page, click on "ask a question," type in "browser," and then click "go.") Utilizing new browser editions allows you to experience more sophisticated activities available on the world wide web (www).
- A sketch pad or unlined drawing paper and pencils.
- 11x17 poster board.
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- Read the Background Information
to prepare you for this exercise.
- Go to the website: cellsalive.com.
- At cellsalive, click on Cell Models on the navigation bar on the left side of the screen. Then scroll down the cell models page and click on, in turn, the animal and then the plant cell. As you study these models close-up, you can scroll down and select (click-on) the name of an organelle you wish to study.
For greater detail, locate the ALTA Vista
search engine on the search page of cellsalive, and type in the
word "organelles." You will be presented with the possibility
of exploring hundreds of websites. Look over a few, and then choose
two to investigate further looking for clarity of graphics and
understandable text.
- Find and read about each of the following organelles based on the websites you visit:
- nucleus
- mitochondria
- Golgi
- endoplasmic reticulum
- ribosomes
- lysosomes
- chloroplasts
- vacuole
- cell wall
- cell membrane
- Use one poster board (11x17 inches) for your drawings. Neatly draw one animal cell (eucaryotic) one bacterial cell (procaryotic) and one plant cell on the poster. Insert and label the organelles (listed above) which are known to be found in each of these three cell types. Make your drawings so as to illustrate the basic structure of each organelle. You do not have to be a great artist for this work. Just be neat. On the back of your poster, write concise descriptions of the functions for each of the organelles you labeled in your cells. Submit your poster in-class.
- Finally, study the descriptions and movies provided at the cellsalive website concerning the following cellular processes:
- diffusion
- osmosis
- active transport
- phagocytosis
- pinocytosis
- Provide your own descriptions of each of these five processes.
Write your descriptions on the contact page of this website and
submit this portion of your work to your professor by email.
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