The document discusses the history and key figures in the discovery and establishment of the cell theory. It notes that cells were first observed in the 1600s using early microscopes. Key contributors included Hooke, who first observed cells in cork in 1665 and coined the term "cell", and van Leeuwenhoek who observed single-celled organisms in pond water in the 1670s. In the 1830s, Schleiden and Schwann established that plants and animals are composed of cells, respectively, and Schwann proposed the original cell theory. Virchow later expanded on this in 1858 by stating that all cells come from pre-existing cells.

1. Cell Discovery & Cell
Theory
Presented by: Joevani S. Peñol

2. What is a Cell?

3. Cell
• The structural and
functional unit of all
living organism.

4. History
• The study of cells started about three hundred
years ago.
• With the help of one powerful instrument the
cell was begin to be known to humans.

5. Cell Discovery
• The scientist who have contributed to the
discovery of the cell:
 Hans and Zacharias Jansen
Robert Hooke
Matthias Schleiden
Theodor Schwann
Robert Brown

6. Anton van
Leeuwenhoek
Rudolph Virchow

8. 1595
• Hans and Zacharias
Jansen
Credited for the
production of lenses.

10. 1665
• Robert Hooke
English Scientist.
Coined the term
“CELL”
He found it in a cork.
Inventor of the
compound
microscope.

11. Cork Oak Tree

12. Cell Wall of a
Cork Cell

13. 1674
• Anton van Leeuwenhoek
Dutch Businessman.
Described cells in a drop of pond water that he
called “animalcules”.
“Father of Ancient
Microbiology”

14. 1833
• Robert Brown
English botanist,
discovered the
nucleus in plant
cells(orchid).

15. Plant Cells

16. 1838
• Matthias Jakob
Schleiden
German
botanist, conclud
ed the all plant
tissues are
composed of
cells.

17. 1839
• Theodor Schwann
German zoologist,
concluded that all
animal tissues are
composed of
cells.
Proposed the cell
theory

18. 1858
• Rudolph Virchow
Completed the cell theory by expounding
his famous conclusion “omnis cellula e
cellula” or cells develop from pre-
existing cells.

19. Cell Theory According to Schwann
1) The cell is the unit of structure,
physiology, and organization in living
things.
2) The cell retains a dual existence as
a distinct entity and a building block
in the construction of organisms.

20. Continued…
3) Cells form by free-cell formation,
similar to the formation of crystals
(spontaneous generation).

21. Spontaneous Generation
The hypothetical process by which living
organisms develop from nonliving matter.

22. Francesco Redi

23. Redi’s Experiment the Disprove
Spontaneous Generation

24. Revised Cell Theory
1. all known living things are made up of cells.
2. the cell is structural & functional unit of all living
things.
3. all cells come from pre-existing cells by division.
(Spontaneous Generation does not occur).

25. References
• http://www.ncbi.nlm.nih.gov/pmc/articles/P
MC2603088/
• http://www.bio.miami.edu/~cmallery/150/uni
ty/cell.text.htm
• http://teachertech.rice.edu/Participants/daws
onm/cells/timeline.htm

26. QUIZ

27. Multiple Choice
Direction: Write the CAPITAL LETTER of
the correct answer on your paper.
1. What is the structural and functional
unit of all living organism?
A. Tissue
B. Cell
C. Organ
D. Organ System

28. 2. Who was the German Physiologist who
completed the Cell Theory?
A. Theodor Schwann
B. Matthias Schleiden
C. Rudolph Virchow
D. Robert Hooke

29. 3. Who was the German Botanist who
stated that all plants are made up cells?
A. Theodor Schwann
B. Matthias Schleiden
C. Anton van Leeuwenhoek
D. Robert Brown

30. 4. Who discovered the nucleus of the
cell?
A. Robert Hooke
B. Robert Brown
C. Rudolph Virchow
D. Hans and Zacharias Jansen

31. 5. He falsified the spontaneous
generation
A. Theodor Schwann
B. Francesco Redi
C. Anton van Leeuwenhoek
D. Robert Hooke

32. 6. He used his simple microscope in
observing cells from a drop of pond
water that he called “animalcules”
A. Hans and Zacharias Jansen
B. Theodor Schwann
C. Anton van Leeuwenhoek
D. Rudolph Virchow

33. 7. He is a German Zoologist who stated
that all animals are composed of cells
A. Matthias Schleiden
B. Theodor Schwann
C. Robert Brown
D. Robert Hooke

34. II. Enumeration
• 8-10 State the Cell Theory
8.
9.
10.

36. 1. What is the structural and functional
unit of all living organism?
A. Tissue
B
B. Cell
C. Organ
D. Organ System

37. 2. Who was the German Physiologist who
completed the Cell Theory?
A. Theodor Schwann
C
B. Matthias Schleiden
C. Rudolph Virchow
D. Robert Hooke

38. 3. Who was the German Botanist who
stated that all plants are made up cells?
A. Theodor Schwann
B
B. Matthias Schleiden
C. Anton van Leeuwenhoek
D. Robert Brown

39. 4. Who discovered the nucleus of the
cell?
B
A. Robert Hooke
B. Robert Brown
C. Rudolph Virchow
D. Hans and Zacharias Jansen

40. 5. They/He first constructed a compound
microscope
A. Theodor Schwann
B
B. Hans and Zacharias
C. Anton van Leeuwenhoek
D. Robert Hooke

41. 6. He used his simple microscope in
observing cells from a drop of pond
water that he called “animalcules”
A. Hans and Zacharias Jansen
B. Theodor Schwann
C. Anton van Leeuwenhoek C
D. Rudolph Virchow

42. 7. He is a German Zoologist who stated
that all animals are composed of cells
A. Matthias Schleiden
B
B. Theodor Schwann
C. Robert Brown
D. Robert Hooke

43. • 8-10 State the Cell Theory
8. all known living things are made up of
cells.
9. the cell is structural & functional unit
of all living things.
10. all cells come from pre-existing cells
by division.