1. The Discovery of the Cell
Robert Hooke
cell
The word ”____” was first used in late 1665 by Robert Hooke. He looked at thin slices of cork (plant cells) under the microscope.

2. Cork seemed to be made of thousands of tiny, empty chambers.
Hooke called these chambers “cells” because they reminded him of the tiny rooms in which he lived in the monastery.
Today we know that cells are not empty chambers, but contain much living matter.

3. Anton van Leeuwenhoek – late 1600’s
Leeuwenhoek made many simple microscopes to observe things in nature that interested him.
He discovered the hidden world of microorganisms in a drop of water. He called them “little beasties”.
He was the first to:
…. see and describe microorganisms under the microscope.

4. On the road to the cell theory….
Matthias Schleiden
Theodore Schwann
German Botanist
1838
German
Zoologist
1839
Schwann said that all animals are made of cells.
Schleiden said that all plants are made of cells.

5. Rudolph Virchow
1858
In 1858, Dr. Rudolph Virchow said that cells could only arise from preexisting cells.

6. The Cell Theory 1. All living things are composed of cells.
2. Cells are the basic units
of structure and function
in living things.
New cells are produced
from existing cells.

7. Most cells are too small to be seen with the naked eye.
Cell Size
Most cells are too small to be seen with the naked eye.
Some cells such as the yolk of an egg are big. This is because the yolk doesn’t need to take in more nutrients
If a cells volume gets too big, the cell’s surface area will not be able to take in enough nutrients, or get rid of wastes fast enough to keep the cell alive

8. Cell Size

9. Cell Membrane, Cytoplasm, & DNA
Common Cell Parts
All cells have many different functions, and come in different shapes and sizes; however, all cells share the following parts:
Cytoplasm
(yellow)
DNA
Organelles

10. 2 Types of Cells Cells can be categorized into two main groups:
Cells with a nucleus, and cells without a nucleus
Prokaryotic
Eukaryotic
No Nucleus
Nucleus

11. Prokaryotes can be divided into two groups:
Bacteria
Archaea

12. EUKARYOTES Plant Animal
Bacteria are the most common & smallest cells known.
Plant
Animal

13. Use pages 64-66 to complete the table (on your notes)
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