7-1: Life is Cellular

Unit 3: Cells

Chapter 7: Cell Structure & Function

Ms. PetrucciBiology

The Discovery of the Cell

The cell was first discovered by Robert Hooke in 1665 using a microscope.

The Cell Theory

1. ALL LIVING THINGS ARE COMPOSED OF CELLS

2. CELLS ARE THE BASIC UNITS OF STRUCTURE AND FUNCTION IN LIVING THINGS

3. NEW CELLS ARE PRODUCED FROM EXISTING CELLS

The Key Players:

• Hooke

• Leeuwenhoek

• Schleiden

• Schwann

• Virchow

Exploring the Cell

• Light Microscopes

• Electron Microscopes– SEM– TEM

• Scanning Probe Microscopes

Prokaryotes and Eukaryotes

• Pro = Before

• Karyon = Nucleus

• Eu = True

• Commonalities: – SURROUNDED BY A BARRIER CALLED A

CELL MEMBRANE– AT SOME POINT IN THEIR LIFE THEY

CONTAINED DNA

Prokaryotic cell parts

Prokaryotic cells have

genetic material

that is NOT contained

in a nucleus

Eukaryotic Cells: Animal Cell

Eukaryotic cells

contain a nucleus in which their

genetic material is separated from the

rest of the cell.

Eukaryotic Cells: Plant Cells

Eukaryotic Cells: Plant Cells