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Exploring the Cell What is a cell? A cell is the basic unit of life Cell Theory: The development and enhancement of _____Microscopes________ made the observation and description of ____microscopic_______ ____organisms__________ and ____living______ ___cells_____ possible. Three parts to the cell theory: 1. The cell is the basic unit of life 2. All living things are made of cells 3. Cells come from pre-existing cells Famous Individuals who helped in the advancement of the cell theory: - Robert Hooke: (1665) - Looked at cork under the microscope and saw tiny empty chambers that he called cells - Anton Van Leeuwenheok: (1674) - Improved the microscope, and was the first to see single celled organisms - Matthais Schleiden: (1838) – All plants are made of cells - Theodor Schwann: (1839) – All animals are made up of cells - Rudolph Virchow: (1855) – Proposed that all cells come from existing cells, completing the cell theory Two types of cells: - Prokaryote - Eukaryote Prokaryotic: - ___Simplest_______ life form All are _____unicellular____________ Two major forms _______eubacteria___________ and ____archaebacteria_______ Prokaryotes are cells that lack _____a nucleus________ and ______membrane________ _____bound_________ _____organelles______ Eukaryotes: - Arose from ____prokaryotes_________ and developed into larger more complex organisms Eukaryotes are cells that contain a ______nucleus_______ and ____organelles__________ surrounded by a membrane Eukaryotic cells: - Can be _______unicellular_______ or _____multicellular____________ Contain a nucleus in which their ____genetic_______ _____material_________ is separated from the rest of the cell. Examples: plants, animals, fungi, and protists