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384 BCE
Aristotle
First to theorize that each germ came from another. Each gene has a "definite parent and a similar offspring" https://quizlet.com/406766437/science-7-cell-theory-flash-cards/ -
Zacharias Jansen
He worked with his father to invent the first compound microscope. His invention helped lead to the rejection of spontaneous generation because his device helped scientists look at the cells of different organisms. Timeline of the Cell Theory and the discovery of the ... - Preziprezi.com › timeline-of-the-cell-theory-and-the-discovery… -
Jan Baptist van Helmont
Proposed that mice could arise from rags and wheat kernels left in an open container for 3 weeks. -
Robert Hooke
First person to observe cells. Coined the term "cell" while observing a piece of cork https://quizlet.com/406766437/science-7-cell-theory-flash-cards/ -
Francesco Redi
Performed an experiment that was one of the first to refute the idea that maggots (the larvae of flies) spontaneously generate on meat left out in the open air. He predicted that preventing flies from having direct contact with the meat would also prevent the appearance of maggots. https://quizlet.com/406766437/science-7-cell-theory-flash-cards/ -
Anton van Leeuwenhoek
Invented a lens for the microscope to magnify 270%. First to see spermatozoa and protozoa https://quizlet.com/406766437/science-7-cell-theory-flash-cards/ -
Lorenz Oken
Developed a new system of animal classification based on evolution. Believed in both the ideas that all living organisms have cells and cells are formed by pre-existing cells" https://quizlet.com/406766437/science-7-cell-theory-flash-cards/ -
Robert Brown
Discovered/named the cell nucleus. Stressed its importance in reproduction and recognized its significance as an essential organelle https://quizlet.com/406766437/science-7-cell-theory-flash-cards/ -
Matthias Schleiden
Who looked at numerous plant samples. Schleiden was the first to recognize that all plants, and all the different parts of plants, are composed of cells. https://science.howstuffworks.com/innovation/scientific-experiments/scientific-method4.htm -
Theodor Schwann
Reached the same conclusion as Schleiden but in animals. Ended controversy that plants and animals were fundamentally different. Examined the cellular structure in animal cartilage and determined that cells are the basic unit of life which included the first statement of the cell theory: All living things are made up of cells. https://quizlet.com/406766437/science-7-cell-theory-flash-cards/ -
Albrecht von Roelliker
Discovered through the help of powerful microscopes that the sperm and egg were composed of cells and that humans are formed of cells from beginning to end. -
Robert Remak
Discovered that the origin of cells was by the division of pre-existing cells. As well as several other key discoveries. https://en.wikipedia.org/wiki/Robert_Remak -
Rudolf Virchow
First to demonstrate that the cell theory applies to both normal and diseased cells. Added to the cell theory and strengthened the theory that cells exist from pre-existing cells. https://quizlet.com/406766437/science-7-cell-theory-flash-cards/ -
Louis Pasteur
Conducted experiments similar to Neddham but used it to disprove spontaneous generation. Used S shaped beaker to trap microorganisms and prevent them from entering broth. Postulated the germ theory which states that microorganisms cause infectious diseases. Proved the cell theory by showing that spontaneous generation does not exist and all cells are formed by pre-existing cells. https://quizlet.com/406766437/science-7-cell-theory-flash-cards/
