Scientists and

The Cell Theory

The CellThe smallest unit that can perform all life processesCells are the building blocks of life

The average human being is composed of around 100 Trillion individual cells!!!

It would take as many as 50 cells to cover the area of a dot on the letter “i”

Cells are the smallest unit that can perform all life processes and are the building blocks of life.A. True

B. False

Cell DiversityLots of shapes and sizes

Typical Cell

Anton van Leeuwenhoek1632 – 1723

He is known as the “Father of the microscope.”

1673: He looked at pond scum under the microscope and discovered small organisms he called animalcules or little animals (Protists)

1676: discovered bacteria

http://en.wikipedia.org/wiki/Anton_van_Leeuwenhoek

http://www.kent.k12.wa.us/staff/TimLynch/sci_class/chap09/lesson_protista/Protista_Lesson.html#Algae

Anton van Leeuwenhoek is the considered the father

of the periodic table.A. TrueB. False

He was the father of the microscopes

Robert Hooke1635 - 1703

Wrote and published “Micrographia”

Known as the “English Father of Microscopy”

Contributions:- He observed pieces of cork from the bark of a cork tree under the microscope.

- His observations led him to coin the word “cell.”

- “Cell”- means little rooms in Latin

- He compared the small boxes to the small rooms that monks lived in.

http://www-groups.dcs.st-and.ac.uk/~history/PictDisplay/Hooke.html

150-200 Year Gap???Between the Hooke/Leuwenhoek discoveries and the mid 19th century, very little cell advancements were made.

Probably due to the widely accepted, traditional belief in Spontaneous Generation.

Examples: -Mice from dirty clothes/corn husks-Maggots from rotting meat

19th Century AdvancementMuch doubt existed around Spontaneous GenerationConclusively disproved by Louis Pasteur

Pasteur: Ummm, I don’t think so!!!

+ =?

Matthias Schleiden1804 – 1881

German botanist – botany the study of plants

Discovered that all plants were made of cells

Contributed to the creation of the cell theory

http://www.britannica.com/eb/article-9066147/Mathias-Jacob-Schleiden

Theodor Schwann1810 – 1882

German zoologist – zoology the study of animals

Concluded that all animals are made of cells.

Contributed to the creation of the cell theory

http://www.nndb.com/people/357/000096069/

Rudolph Virchow1821 - 1902

German pathologist – pathology the study of disease

He is known as the “Father of Pathology.”

Discovered that all living cells come only from other living cells.

http://en.wikipedia.org/wiki/Image:Rudolf_Virchow.jpg

The Cell TheoryMajor Contributors:

Matthias SchleidenTheodor SchwannRudolph Virchow

The Cell Theory1. All living things are made of

cells.

2. Cells are the basic units of structure and function in living things.

3. Living cells come only from other living cells.

Modern Cell Theory added:

The cells contain information(DNA) which is passed on from cell to cell during cell division

All cells are basically the same in chemical composition and metabolic activities.

All basic chemical & physiological functions are carried out inside the cells.(movement, digestion,etc)

Cell activity depends on the activities of structures in the cell(organelles, nucleus, plasma membrane)