By the end of class, I will be able to… Identify the three principles of the cell theory. Describe how continuous investigations and/or new scientific information influenced the development of cell theory. Identify the structure and function of cell organelles.
The Cell Theory
The Cell Theory History
The Cell Theory History Robert Hooke Discovers the cell (1665) " little boxes or cells distinct from one another."
The Cell Theory History Francisco Redi makes first attempt at disproving “spontaneous generation” (1668)
The Cell Theory History Anton van Leeuwenhoek discovers “animalcules” (single-celled organisms) swimming in a drop of pond water (1674)
The Cell Theory History Matthias Schleiden proposes that plants are made of cells (1838) Original drawing of plant cells by Schleiden.
The Cell Theory History Theodor Schwann Studied animal cells After comparing observations with Schleiden, concludes that all living things are made of cells and that these cells form spontaneously by free-cell formation (1839) Original drawings of plant and animal cells
The Cell Theory History Rudolf Virchow after studying cell division, reports that all cells come from pre-existing cells (1855)
The Cell Theory Establishes the following three principles: All organisms are made of cells. All existing cells are produced by other living cells. The cell is the most basic unit of life. Developed after a span of 200+ years of many scientists studying cells
Cell Theory Recap After years of studying, the scientific community made the following conclusions...
All organisms are made of cells.
All existing cells are produced by other living cells.
The cell is the most basic unit of life. Characteristics of Life Cells Homeostasis Adapt (EVOLVE) Respond to their Environment Grow and Develop Energy and Materials Reproduce DNA
Cell Structure The development of technology, like the microscope not only allowed scientists to develop the cell theory, but also gave scientists a way to classify cells based on their structure.
Introduction to the Microscope