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Cell Theory
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In 1665, Robert Hooke used an early compound microscope to look at a thin slice of cork, a plant material. Cork looked like thousands of tiny, empty chambers. Hooke called these chambers “cells.”
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Discoveries leading to cell theory:
1664 – Robert Hooke saw and named cells 1838 – Matthias Schleiden concluded that all plants were made of cells 1839 – Theodor Schwann stated that all animals were made of cells 1855 – Rudolph Virchow concluded that new cells were created only from division of existing cells.
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Cell Theory All living things are made of cells
Cells are the basic unit of structure and function of living things Cells come from preexisting cells by reproduction
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All cells have: Cell membrane – controls what enters and leaves the cell DNA – genetic material
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2 categories of cells: Prokaryotes Eukaryotes No nucleus
No membrane bound organelles Ex: bacteria Have a nucleus Have membrane bound organelles Ex: Plants, Animals, Fungi, Protists
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Prokaryote Eukaryote
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1. What are the 3 parts of cell theory?
All living things are made of cells Cells are the basic unit of structure and function of living things Cells come from preexisting cells by reproduction
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2. What 2 things do all cells have?
Cell membrane – controls what enters and leaves the cell DNA – genetic material
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3. How do prokaryotes differ from eukaryotes?
Prokaryotes do not have a nucleus Eukaryotes do have a nucleus.
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