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Wednesday, July 7, 2010

Early discovery on cell

Activity No. ___

Early discovery on cell

I. Reading Selection

1. Robert Hooke (1635 – 1703) an Englishman, he coined the term “cell” when he examined a thin sliced of cork under the microscope. He observed the tiny compartment which resembles little room with surrounding walls.

2. Anton Van Leeuwenhoek (1632 – 1723) discovered bacteria and other microscopic organisms in rainwater and studied the structure of plant and animal cells.

3. Francesco Redi (1627 – 1997) and Lazzaro Spallanzani (1729 – 1799) Italian physician and biologist, disproved the Theory of Spontaneous Generation.

4. Robert Brown (1773 – 1858) a Scottish botanist, discovered the presence of nuclei within cells in 1831.

5. Felix Dujardin, a Frenchman, noted that all living things contain a thick jelly fluid which he called sarcode at that time.

6. Matthias Schleiden (1804 – 1881) and Theodor Schwann (1810 – 1882) a German botanist and zoologist, introduced the concept that all plants and animals are made up of cells.

7. Johannes Purkinje (1787 – 1869) a Czechoslovakian, coined the term protoplasm to refer to the living matter of the cell.

8. Rudolf Virchow (1821 – 1902) a German physician, found that cells divide to form new cells. He concluded that “omnis cellula e cellula” or cells come from pre-existing cells.

9. Luis Pasteur (1822 – 1895) a French chemist, supplied the proof for Virchow’s Theory of Biogenesis.

II. Guide Questions

1. Who was the first to use the term cell?

2. What did Robert Brown discovered?

3. What is the contribution of Rudolf Virchow?

4. Who discovered the presence of nuclei?

5. Who disproved the Theory of Spontaneous Generation?

6. What did Anton Van Leeuwenhoek discovered?

7. How did Johannes Purkinje describe protoplasm?

8. Who are the scientists who contributed in the formulation of cell theory?

III. Analysis

State the Cell Theory

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