THE
CELL
THE CELL THEORY,
STRUCTURES, AND
FUNCTIONS
General Biology - GRADE 12
OBJECTIVES
Determine the events that led to the
formulation of the Cell Theory;
Explain the postulates of the Cell Theory; and
Identify the real-life implications of Cell
Theory, Cell Structures, and Functions.
THE
CELL
THEORY
THE CELL
THEORY
Cell Theory or Cell Postulate was first
formally written by Matthias Jakob
Schleiden and Theodor Schwann in
1839.
ZACHARIAS &
HANS
JANSSEN(1595)
1595
ZACHARIAS
&HANS JANSSEN
ROBERT
HOOKE (1655)
Discovered the first cells in cork
through the microscope, he coined the
term "cell" as the boxy figures
reminded him of cells or rooms.
1595
ZACHARIAS
&HANS JANSSEN
1655
ROBERT
HOOKE
ANTONIE VAN
LEEUWENHOEK (1674)
Discovered the first protozoa, a singlecelled organism he called "animalcules"
or the Infusoria in 1674.
1595
ZACHARIAS
&HANS JANSSEN
1655
ROBERT
HOOKE
1674
ANTONIE VAN
LEEUWENHOEK
THE CELL
THEORY(1839)
States that:
The cell is the unit of structure, physiology, and
organization in living things.
The cell retains a dual existence as a distinct entity
and a building block in the construction of organisms.
Cells form by free-cell formation, similar to the
formation of crystals (spontaneous generation).
MODERN CELL THEORY
States that:
All known living things are made up of cells.
The cell is structural & functional unit of all living things.
All cells come from pre-existing cells by division. (Spontaneous
Generation does not occur).
a. Cells contains hereditary information which is passed from cell
to cell during cell division.
b. All cells are basically the same in chemical composition.
c. All energy flow (metabolism & biochemistry) of life occurs
within cells.
MODERN CELL THEORY
States that:
All known living things are made up of cells.
The cell is structural & functional unit of all living things.
All cells come from pre-existing cells by division. (Spontaneous
Generation does not occur).
a. Cells contains hereditary information which is passed from cell
to cell during cell division.
b. All cells are basically the same in chemical composition.
c. All energy flow (metabolism & biochemistry) of life occurs
within cells.
“OMNIS CELLULA E CELLULA”
THE CELL
AND ITS
STRUCTURE
GENERALIZATION