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Transcript
Robert Hooke (1665) saw cells while looking at a piece of cork under the microscope. Anton Von Leeuwenhoek (1673) saw animalcules (“little animals”) in pond scum. Theodor Schwann (mid 1800’s) Cell Theory: 1. all organisms are composed of one or more cells. 2. the cell is the basic unit of life in all living things. Added by Rudolf Virchow in 1858: 3. all cells come from existing cells. Cell membrane – protective barrier that controls the passage of material into and out of the cell. Organelles – structures that enable the cell to live, grow, and reproduce. Cytoplasm – cellular fluid Nucleus – membrane covered organelle that holds the DNA Prokaryotic – simple cells (oldest fossils have prokaryotic bact. 3.5 billion years old) no nucleus no membrane covered organelles circular DNA Bacteria Eukaryotic – Nucleus Membrane-covered organelles Linear DNA All other cells