Introduction

to the

Cell

Discovery of the Cell1665 Robert Hooke saw

the cell walls of cork – called them cells

I673 Anton van Leeuwenhoek saw the first living cells in a drop of water – “little animals”

3 important discoveries that lead to the cell theory.

1838 Matthias Schlediden concluded all plants were composed of cells

3 important discoveries that lead to the cell theory.

1839 Theodor Schwann concluded all animals were composed of cells1838 Matthias Schlediden concluded all plants were composed of cells

3 important discoveries that lead to the cell theory.

1838 Matthias Schleiden concluded all plants were composed of cells1839 Theodor Schwann concluded all animals were composed of cells1855 Rudolf Virchow observed cell division.

The Cell TheoryAll living things are composed of cells

The Cell TheoryAll living things are composed of cellsCells are the basic units of structure and function in an organism

The Cell TheoryAll living things are composed of cellsCells are the basic units of structure and function in an organismCells come only from the reproduction of existing cells

Cell Diversity – not all cells are alike

They vary depending on their function

Cells contain a variety of internal structures called organelles.

Organelle –a cell component that performs specific functions for the cell

The 2 main types of cells:

1. Prokaryotes – cells without a nucleus or membrane-bound organelles

Bacteria cells

2. Eukaryotes – cells that have a nucleus and membrane bound organelles.

Quick Quiz

• Who were the three scientists to develop the cell theory?

• What are the three parts of the cell theory?• What are the two main types of cells?