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REVIEW: Characteristics of Life All living things are: •Made of cells •Grow and develop •Reproduce •Have genetic code (DNA) •Obtain and use energy •Respond to their environment •Maintain homeostasis •Evolve The cell theory grew out of the work of many scientists and improvements in the microscope. • Many scientists contributed to the cell theory. Scientists 1665 Robert Hooke used an early compound microscope to look at a thin slice of cork (you use a cork and a “hook” to fish) He saw thousands of tiny chambers he called "cells" . Today we know that cells are not empty. They contain living matter. Scientists •Anton van Leeuwenhoek observed pond water and other things. •The microscope revealed a world of tiny living organisms. Scientists •Matthias SchleidenBotanist that said all plants are made of cells Scientists •Theodor Schwann- Biologist that said all animals are made of cells •(Schwann sound like swan = animal) Scientists •Rudolf Virchow- Said cells come from other cells Cell Theory •1. All living things are made of cells Cell Theory •2. Cells are the basic units of structure and function in living things. •Cells are the basic unit of life. Cell Theory •3. Cells come from other cells. Cell Structure •Cells are a variety of sizes and shapes. •All cells have two things in common: 1) surrounded by cell membrane 2) contain DNA Two Kinds of Cells •Prokaryotic- Do NOT have a true nucleus or membrane bound organelles •Example: Bacteria What is Bacteria? Two Kinds of Cells • Eukaryotic- DO have a true nucleus and membrane bound organelles • Examples: Plants, Animals, Fungi, Protists • Usually larger and more complex than prokaryotic cells. • Great variety of types. • A eukaryotic cell is similar to a factory. Nucleus and Organelles •PRO – NO •EAU - DO http://Prokaryotes vs Eukaryotes Video