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 All living things are made of one or more CELLS.

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Presentation on theme: " All living things are made of one or more CELLS."— Presentation transcript:

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2  All living things are made of one or more CELLS.

3 Some organisms consist of ONE cell while others have MANY cells.

4 Regardless of the number of cells, living things must carry on all the life PROCESSES. This cell is in the process of cell REPRODUCTION.

5 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.

6  ROBERT HOOKE who examined thin slices of CORK and other plant tissues.  He found that they contained BOXLIKE structures which he called CELLS.

7 …DEAD cells. He never observed the cells of living things.

8 POND water using a very powerful single- lens microscope. Leeuwenhoek also observed human BLOOD cells and BACTERIA which are the smallest kinds of cells.

9  1824 – Henry Dutrochet  Proposed that all living things were made from cells.  1831 – Robert Brown  Observed and named the NUCLEUS

10  1838 – Matthias Schleiden  Developed the theory that all plants contained cells.  1839 – Theodor Schwann  Proposed that all animals contained cells.

11  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.

12  1861 – Max Schultze  Defined “protoplasm” as the physical basis of life.  1861 – Felix Dujardin  Recognized the existence of one- celled organisms.

13 They were also able to describe the events of cell DIVISION in which one cell splits to form TWO cells.

14  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.

15  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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