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Cell Theory
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.”
Discoveries leading to cell theory:
1665 – 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.
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
All cells have:
Cell membrane – controls what
enters and leaves the cell
DNA – genetic material
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
Prokaryote
Eukaryote
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
2. What 2 things do all cells have?
Cell membrane – controls what enters and
leaves the cell
DNA – genetic material
3. How do prokaryotes differ from
eukaryotes?
• Prokaryotes do not have a nucleus
• Eukaryotes do have a nucleus.