Cell Theory
SC.912.L.14.1 Describe
the scientific theory of
cells (cell theory), and
relate the history of its
discovery to the
process of science.
Source: http://1.bp.blogspot.com/-zc8QRuqqzQ/U5sLdZXLsvI/AAAAAAAAACs/c1nRqQwFWCc/
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What do I need to know?
 Explain the three stipulations of
the cell theory and how
continuous investigations and
new scientific information
influenced the development of
the cell theory
Cell Theory
The cell theory is composed
of 3 statements developed
after numerous
observations of cells by
several different scientists.
1. All living things are
composed of one or
more cells
2. The cell is the basic unit
of structure and function
of living things.
3. New cells arise from
existing cells.
Source: http://1.bp.blogspot.com/-zc8QRuqqzQ/U5sLdZXLsvI/AAAAAAAAACs/c1nRqQwFWCc/
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Cell Theory
Guiding Questions:
What invention allowed for the
development of the cell theory?
How did the cell theory develop
over time?
How many scientists
contributed to the development
of the cell theory?
Did the scientists always agree
with each other?
Video:
https://www.youtube.com/watch?v=4OpBylwH9DU
Show What You Know
 The cell theory was first proposed in 1838.
Evidence obtained through additional
scientific investigations resulted in the
current cell theory. Which statement
describes a component of the original cell
theory that was removed because of the
new scientific knowledge?
A. All living things are made of cells.
B. All cells come from other preexisting cells.
C. Cells form through spontaneous
generation
D. Cells are the basic structural and
functional units of life.
Show What You Know
 All cells regardless of which type they are have a
few things in common: DNA, cytoplasm and cell
membrane. These three together form a perfect
combination and make something that is alive,
yet, individually (the cytoplasm alone, or the DNA
alone), they are just a group of chemicals. What
tenet or premise of the cell theory does this
finding support?
A. All modern cells come from preexisting cells.
B. All cells contain genetic material (DNA).
C. Every living thing is made up of one or more cells.
D. The cell is the basic unit of structure and function
of life.
Show What You Know
 To help patients replenish bodily fluids
quickly during an illness, doctors need to
understand how cells behave in their
environment. Doctors have confidence in
what they know about how cells behave
because?
A. Large medical institutions have conducted
their own experiments justifying the cell theory.
B. What we know about cell theory has been
published in reputable journals.
C. Cell theory has been tested, refined, and
observed to be true over hundreds of years.
D. The basics of cell theory have not changed
much since the original experiments.
Show What You Know
Which invention from the 17th century
allowed the development of modern cell
theory?
A. Scanning electron microscope
B. Computers
C. X-ray
D. Light microscope