Cells Intro - PDF Notes
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These notes detail the history of cell theory, from the discovery of cells to the development of the three principles of cell theory. It also describes prokaryotic and eukaryotic cells, highlighting their key differences.
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# Notes: Cells Intro ## The Wacky History of Cell Theory - **1665**: Robert Hooke used a compound microscope to look at cork "cells," which he described as tiny rooms. - **1674**: Anton van Leeuwenhoek saw "animalcules" (living cells) under a microscope. He printed a book of living microbes. - **1...
# Notes: Cells Intro ## The Wacky History of Cell Theory - **1665**: Robert Hooke used a compound microscope to look at cork "cells," which he described as tiny rooms. - **1674**: Anton van Leeuwenhoek saw "animalcules" (living cells) under a microscope. He printed a book of living microbes. - **1836**: Matthias Schleiden determined that "all plants are made of cells." - **1839**: Theodor Schwann continued this work and discovered that "all animals are made of cells." - **1855**: Rudolf Virchow observed cell division, suggesting that "all cells come from preexisting cells." ## Cell Theory 1. All living things are composed of cells 2. Cells are the basic unit of structure and function in living things 3. New cells are produced from existing cells ## 2 Cell Types ### Prokaryotic - **"pro"** = before - **"kary"** = nugget/nut - nucleus (DNA) - Found in bacteria - **Characteristics:** - Single cells: unicellular - Smaller - No nucleus - No membrane-bound organelles - Only membrane is the cell membrane. ### Eukaryotic - **"eu"** = true - **"kary"** = nugget/nut - nucleus (DNA) - Found in all organisms except bacteria (protists, fungi, plants, animals) - **Characteristics:** - Single cells or multicellular - 10-100x larger than bacteria (usually) - nucleus with DNA in the nuclear membrane surrounded by membrane - Many organelles There is a diagram illustrating the cell types with descriptions of the components of each cell. ## Prokaryotes vs. Eukaryotes | Prokaryotes | Eukaryotes | |-----------------------------------------|-----------------------------------------------------------------| | 1. No nucleus | 1. Nucleus | | 2. No membrane-bound organelles | 2. Membrane-bound organelles | | 3. Bacteria | 3. All organisms except for bacteria | | 4. Smaller | 4. 10-100x larger | | 5. Unicellular | 5. Unicellular + multicellular | | 6. Simplest | 6. More complex cells |
