Cell theory

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Scanning Tunneling Microscope (STM)

able to show arrangement of atoms

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Cell Theory

A theory resulting from many scientists’ observations & conclusions

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Cell Theory 1. The basic unit of life is the cell. (Hooke)

In 1665, an English scientist named Robert Hooke made an improved microscope and viewed thin slices of cork viewing plant cell walls

Hooke named what he saw "cells"

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CELL THEORY 2. All living things are made of 1 or more cells.

Matthias Schleiden (botanist studying plants)

Theodore Schwann (zoologist studying animals) stated that all living things were made of cells

Schleiden

Schwann

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CELL THEORY 3. All cells divide & come from old cells. (Virchow)

Virchow