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All living things are made of one or more CELLS.
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Some organisms consist of ONE cell while others have MANY cells.
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Regardless of the number of cells, living things must carry on all the life PROCESSES. This cell is in the process of cell REPRODUCTION.
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MICROSCOPE was very important to the discovery of cells. It was not until the mid-1600’s that microscopes were used to examine the parts of living things.
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ROBERT HOOKE who examined thin slices of CORK and other plant tissues. He found that they contained BOXLIKE structures which he called CELLS.
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…DEAD cells. He never observed the cells of living things.
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POND water using a very powerful single- lens microscope. Leeuwenhoek also observed human BLOOD cells and BACTERIA which are the smallest kinds of cells.
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1824 – Henry Dutrochet Proposed that all living things were made from cells. 1831 – Robert Brown Observed and named the NUCLEUS
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1838 – Matthias Schleiden Developed the theory that all plants contained cells. 1839 – Theodor Schwann Proposed that all animals contained cells.
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1839 – Johannes Purkinje Used the term “protoplasm” to refer to the jelly-like material in a cell. 1855 – Rudolf Virchow Stated that all living cells came from other cells.
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1861 – Max Schultze Defined “protoplasm” as the physical basis of life. 1861 – Felix Dujardin Recognized the existence of one- celled organisms.
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They were also able to describe the events of cell DIVISION in which one cell splits to form TWO cells.
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The Cell Theory states that…. › All organisms are made of ONE or more CELLS › All cells carry on LIFE ACTIVITIES › New cells ARISE only from other LIVING cells by the process of CELL DIVISION.
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The first cell could not have come from a pre-existing cell. Although viruses can carry on many life processes, they DO NOT contain cells Mitochondria and chloroplasts contain their own DNA and can reproduce within a cell.
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