9Robert Hooke 1665 – English Physicist Used one of the first light microscopes to look at thin slices of plant tissues.
10Robert Hooke One of these, a slice of cork. Under the microscope the cork seemed to be made of thousands of tiny chambers.Hooke called these chambers “cells”, because they reminded him of a monastery's tiny rooms aka cells.
14Search For Cells In Other Living Things 1838 – Matthias SchleidenAll plants are made of cells1839 – Theodore SchwannAll animals are made of cells1855 – Rudolf VirchowStudied cell reproduction.“Where a cell exists, there must have been a preexisting cell…”
15New Discoveries CELL THEORY The discoveries of these and other biologists are summarized in one of the fundamental concepts of biology.CELL THEORY
16Cell Theory All living things are composed of cells. Cell are the basic units of structure and function in living things.New cells are produced from existing cells.
17Prokaryotes and Eukaryotes Biologists divide cells into two categories:Prokaryotes and Eukaryotes
18Compare and Contrast Eukaryotes Smaller and Simpler ProkaryotesSmaller and SimplerHave Cell Membrane and CytoplasmNo NucleiExamples (Bacteria)EukaryotesLarger and More ComplexHave Cell Membrane, Cytoplasm, Nucleus, Dozens of Specialized Structures (Organelles)Examples: All Plants, Animals, and Fungi, and Many MicroorganismsSome Live Solitary Lives