Cell Discovery and Cell Theory

Cell Discovery and Cell Theory

Web Quest

OBJECTIVES:
1. Name the scientists who first observed living and nonliving cells.
2. Summarize the research that led to the development of the cell theory
3. State the three principles of the cell theory.
4. Explain why the cell is considered to be the basic unit of life.

Introduction: Before the seventeenth century, no one knew that Cells existed. Most Cells are too small to be seen with the unaided eye. Cells were not discovered until after the invention of the microscope in the early seventeenth century. One of the First Microscopes was made by the Dutchman Anton von Leewenhoek. With his hand-held microscope, Leewenhoek became the FIRST person to OBSERVE and DESCRIBE MICROSCOPIC ORGANISMS and LIVING CELLS. However the term CELL comes to us from another important scientist.

Go to the web site by clicking on the hyperlink below or entering the URL

ionlearning.com/library/module_viewer.php?mid=64&l=&c3

Answer the questions below by reading the text and exploring the webpage. Using your computer mouse you should scroll over the highlighted words within the text and sub-notes will appear.

Questions:

1. Who observed tiny chambers within cork and called them cells?

2. List three scientists who contributed to the development of the Cell Theory,

3. Write the four basic premises of the Cell Theory.

4. What two generalizations can be made about cells and life?

Go to the website thlifescience.com/CellTheory.htm to learn about the history of the cell theory and learn about each scientists background and contributions to cell theory. Identify the scientist below:

A. ____________- studied a variety of PLANTS and concluded that all PLANTS "ARE COMPOSED OF CELLS" and the cell is the basic building block of plant matter.

B. ____________- reported that ANIMALS are also made of CELLS and proposed that cells are the basic unit for all life.

C. ____________- induced ominus cellula e cellula " THAT CELLS ONLY COME FROM OTHER CELLS".

FOR REVIEW:

Go back to the web site ionlearning.com/library/module_viewer.php?mid=64&l=&c3

by clicking on the hyperlink above or entering the URL. Scroll down to the middle of the page and answer the following.

1. What is the most important PRODUCT of cells and lies at the center of all cellular activity?

2. What is cytology?

3. All cells, regardless of function, have THREE BASIC FEATURES. Summarize these below:

A.

B.

C.

4. Describe the differences between PROKARYOTIC and EUKARYOTIC cells and provide an example of an organism of each type.

5. Cite TWO important differences between PLANT and ANIMAL cells.

6. Are all cells within an organism the same? If so, How can they differ?

For Review:

Cell Discovery and Cell Theory

Web Quest

Part II

In this section of the Web Quest you will go into the cell and take a closer look at the various structures that carry out the functions and life activities of cells. Click on the hyperlink below or type the URL into the search bar.

.gov/news/overviews/biology/interactive.jsp

To activate this page, click on the picture. You should now be able to navigate freely throughout the cell. When you “mouse over” a numbered structure the name of that structure will appear. Click on the name and you will be linked to a brief description of the ORGANELLE and its function. When you are finished reading about the structure and function of the organelle, click on the Explore more to navigate back to the cell.

Next go to: lsalive.com/cells/3dcell.htm

From the Cell Models page, click on the links for plant and animal cells explore the interactive feature by dragging your mouse over the cells.

Following this you will complete a chart on the various functions of the organelles.

*Once you get to the diagram you can learn about the function each organelle by either clicking on the structure in the diagram or by clicking on the name of each organelle to the right of the page. You are only required to learn the organelles on your sheet even though there are many others on the webpage. Using colored pencils, color code the structures in the diagram provided to match the functions in the chart. Although this diagram is not exactly like the one on the webpage, a textbook can also be used to identify these structures.