Cell-Theory.pdf

Cell Theory Mark Archei O. Javier, MSc Discovery of the Cells 1665 – Robert Hooke, English Scientist, discovered cells while looking at a thin slice of cork. He described the cells as tiny boxes or a honeycomb. He thought that cells only existed in plants and fungi. Discovery of the Cells...

Cell Theory Mark Archei O. Javier, MSc Discovery of the Cells 1665 – Robert Hooke, English Scientist, discovered cells while looking at a thin slice of cork. He described the cells as tiny boxes or a honeycomb. He thought that cells only existed in plants and fungi. Discovery of the Cells 1673 – Anton van Leuwenhoek looked at pond water and saw small creatures. (200x magnification) “Animalcules” – single-celled organisms He also observed blood cells from fish, birds, frogs, dogs, and humans. Therefore, it was known that cells are found in animals as well as plants. Discovery of the Cells Francesco Redi John Needham Lazzaro Spallanzani Louis Pasteur Discovery of the Cells 19th Century Advancements Pasteur conclusively disproved the Theory of Spontaneous Generation Discovery of the Cells – The Cell Theory Discovery of the Cells – The Cell Theory  1. All organisms are composed of one or The Cell more cells. 2. The cell is the basic unit Theory of life. 3. All cells come from pre- existing cells. THE CELL THEORY THE CELL THEORY THE CELL THEORY  All known living things are made up of cells The cell is the structural & functional The unit of all living things. All cells come from pre-existing Modern cells by division. Cells contain hereditary information Cell that is passed from cell to cell during cell division. Theory All cells are basically the same in chemical composition. All energy flow of life occurs within cells.  All cells are basically the same in chemical composition. Cells contain hereditary information that is passed from cell to cell during cell division. All energy flow of life occurs within cells. Exceptions of the Cell Theory 1. Viruses are considered alive by some, yet they are not made up of cells. Viruses have many features of life, but by definition of the cell theory, they are not alive. Exceptions of the Cell Theory 2. The first cell did not originate from a pre-existing cell. There was no exact first cell since the definition of cell is imprecise. Exceptions of the Cell Theory 3. Mitochondria and chloroplasts have their own genetic material and reproduce independently from the rest of the cell. What are the contributions of the development of Cell Theory today? What are the contributions of the development of Cell Theory today? Group 1 – Medicine Group 2 – Agriculture Group 3 – Biotechnology Group 4 – Other fields of science