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Section 7.1- Life is Cellular Section 7.2- Eukaryotic Cell Structure Section 7.3- Cell Boundaries Section 7.4- Diversity of Cellular Life Discovery of Cells Robert Hooke Used light microscope to look at cork cells Cells reminded him of monk cubicles “many little boxes” Called them CELLS Discovery of Cells Anton van Leewenhoek First to observe living cells Invented simple, tiny microscopes The cell theory states that: all living things are composed of one or more cells cells are the basic units of structure and function in an organism cells come only from the reproduction of existing cells Cellular Basis of Life All living things are made of organized parts obtain energy from their surroundings perform chemical reactions change with time respond to their environment reproduce. Prokaryotes Prokaryote cells lack a nucleus and membrane-bound organelles. Have genetic material not contained in a nucleus Eukaryotes Eukaryote cells have a nucleus and membranebound organelles