Transcript Pasteur: Ummm, I don`t think so!!!

Scientists
and
The Cell Theory
The Cell
The smallest unit that can perform all life
processes
Cells 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 Diversity
Lots of shapes and sizes
Typical Cell
Anton van Leeuwenhoek
1632 – 1723
He is known as the “Father of the
microscope.”
http://en.wikipedia.org/wiki/Anton_van_Leeuwenhoek
1673: He looked at pond scum under the
microscope and discovered small
organisms he called animalcules or little
animals (Protists)
1676: discovered bacteria
http://www.kent.k12.wa.us/staff/TimLyn
ch/sci_class/chap09/lesson_protista/Pr
otista_Lesson.html#Algae
Anton van Leeuwenhoek is the
considered the father of the
periodic table.
A. True
B. False
He was the father of the
microscopes
Robert Hooke
1635 - 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.
http://www-groups.dcs.stand.ac.uk/~history/PictDisplay/Hooke.html
- 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.
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 Advancement
Much doubt existed around Spontaneous Generation
Conclusively disproved by Louis Pasteur
+
=
Pasteur: Ummm, I
don’t think so!!!
?
Matthias Schleiden
1804 – 1881
German botanist – botany the
study of plants
http://www.britannica.com/eb/article9066147/Mathias-Jacob-Schleiden
Discovered that all plants were
made of cells
Contributed to the creation of the
cell theory
Theodor Schwann
1810 – 1882
German zoologist – zoology the
study of animals
Concluded that all animals are
made of cells.
http://www.nndb.com/people/357/000096069/
Contributed to the creation of the
cell theory
Rudolph Virchow
1821 - 1902
German pathologist – pathology
the study of disease
He is known as the
“Father of Pathology.”
http://en.wikipedia.org/wiki/Image:Rudolf_Virchow.jpg
Discovered that all living cells
come only from other living cells.
The Cell Theory
Major Contributors:
Matthias Schleiden
Theodor Schwann
Rudolph Virchow
The Cell Theory
1. 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)