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Download Scientists, Cell Theory and Prokaryote vs. Eukaryote
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Scientists, Cell Theory and Prokaryote vs. Eukaryote What is a Cell? Cell – Basic unit of living things. Organisms are either: Unicellular – made of one cell such as bacteria and amoebas. OR Multicellular – made of many cells such as plants and animals. ALL LIVING THINGS : Are made of cells Can reproduce Have genetic code Grow and develop Obtain/use materials and energy Respond to environment Maintain homeostasis Change over time Cell Theory Confirmed discoveries that all scientists believe to be true about cells: 1. Cells are the basic unit of life. 2. All living things are made of cells. 3. New cells are produced from existing cells. Microscopes Light Microscope – magnifies tiny organisms up to 1,000 times. Uses light and lenses (we use these). Electron Microscope – magnifies up to a million times. Uses electrons. TEM – Transmission Electron Microscope – transmits electrons through a slice of an object. Shows internal structure. SEM – Scanning Electron Microscope – scans the outside of an object (shows 3-D view of the surface). The Discovery of Cells before nucleus true nucleus Prokaryotes NO nucleus NO organelles ALL are unicellular Smaller than eukaryotic cells Forerunner to eukaryotic cells (smaller and more simple) DNA – single strand and circular Ex: ALL Bacteria Eukaryotes Has a nucleus with a nuclear envelope Bigger and more complex than prokaryotes Have Organelles DNA – double-stranded and forms chromosomes (highly organized) Can be uni- OR multicellular Ex: animals, plants, fungi Similarities Contain all four biomolecules Have ribosomes Have DNA Similar Metabolism Can be unicellular Have cell membranes
