FOUNDERS OF CELL THEORY

ROBERT HOOKE

• Robert Hooke used a _______ microscope to study ________ (obtained from dead oak bark)

ROBERT HOOKE

• He called them _______ because they reminded him of the small rooms ________ lived in at the monastery

ROBERT HOOKE

• ________ ARE THE BASIC UNITS OF ALL LIVING THINGS!!!

Matthias Schleiden

• Matthias Schleiden is a German scientist who studied ________

Matthias Schleiden

• He concluded that _______________ _______________

Theodor Schwann

• Theodor Schwann is a German scientist who studied __________

Theodor Schwann

• He concluded that _______________ _______________

CELL THEORY

• The CELL THEORY is made up of ___ parts.

CELL THEORY

• 1) All organisms are composed of one or more cells.

• 2) The cell is the basic unit of structure and organization of organisms.

• 3) All cells come from pre-existing cells.

Anton van Leeuwenhoek • Leeuwenhoek lived at the same time as Robert Hooke, (1600’s) and used a simple light microscope to view object.

• Over the next 200 years, scientists improve microscopes and develop a compound light microscope.

– Which uses a series of lenses to magnify objects up to 1500X.

Electron Microscopes • First used in the 1930’s & 1940’s • Uses a beam of electrons to magnify up to 500,000X • Structures within cells can be seen • Specimens must be examined in a vacuum • Two basic types: – Scanning (SEM) – Transmission (TEM))

How an Electron Microscope Works

Image of a hydrothermal worm taken with an Electron Microscope

A single Carbon atom

1. Eyepiece 2. Body tube 3. Coarse Adjustment 4. Fine Adjustment 5. Arm 6. Base 7. Light Source 8. Diaphram 9. Stage 10. Stage clip 11. Low power objective 12. High power objective