Section 3 1 Cells 3 1 Cell Theory
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Section 3 -1 “Cells”
3. 1 Cell Theory KEY CONCEPT: Cells are the Basic unit of life.
3. 1 Cell Theory The cell theory grew out of the work of many scientists and improvements in the microscope. • Many scientists contributed to the cell theory.
3. 1 Cell Theory Robert Hooke: 1665 - First to identify cells and named them “cells. ” Anton Van Leeuwenhoek: 1674 – Made more powerful lenses. Able to view living cells – greater detail. Matthias Scheiden: 1838 – First to propose that plants are made of cells. Theodor Schwann: 1839 – Published theory that all living things are made of cells. Rudolf Virchow: 1855 – Proposed that all cells come from preexisting cells.
3. 1 Cell Theory • The Cell Theory: 1. All organisms are made of cells
3. 1 Cell Theory 2. All existing cells are produced by other living cells
3. 1 Cell Theory 3. The cell is the most basic unit of life
3. 1 Cell Theory • All cells share certain characteristics: –Cells tend to be microscopic. –All cells are enclosed cell membrane by a membrane. –All cells are filled with cytoplasm Bacterium (colored SEM; magnification 8800 x)
3. 1 Cell Theory There are two cell types: 1. Eukaryotic cells: nu cle us • Have a nucleus • Have membranebound organelles • Usually multi-cellular Example: • plants, animals s e l l ne a g r o cell membrane
3. 1 Cell Theory 2. Prokaryotic cells: • Do not have a nucleus • Do not have membrane-bound organelles • Usually single-celled • Example: bacteria cell membrane m s a l p cyto
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3. 1 Cell Theory Videos Overview of the Cell Structure https: //www. youtube. com/watch? v=URUJD 5 NEXC 8 Golgi Apparatus / Protein Modification https: //www. youtube. com/watch? v=rvfv. Rgk 0 Mf. A