Lesson 1: Discovering Your Personal Genius - The Hadley School
Lesson 1 discovering the cell
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Transcript of Lesson 1 discovering the cell
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LESSON #1What is so extraordinary about the organizationof living organisms?
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DISCOVERING THE
CELL
The unit of life
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Levels of
biological
organizatio
n
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Before the 1800s
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How were cells discovered?
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Discovering the principles of the
microscope
In 1590, Zacharias
Janssen, a Dutch
eyeglass maker.
2 overlapped lenses
increase magnification
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Anton Van Leewenhoek (1632-
1723)
Father of microbiology
First to observe living
organisms smaller than
what the human eye can
see.
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Robert Hooke
Scientist
Made an improved
microscope.
First used the word
“cell” to indicate what
living beings are made
of.
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What Hooke saw…
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A pause
In the following
years Hooke’s
discovery didn’t
have much influence
in science.
S. XVII y XVIII
Scientists were
focused on
classifying new
species discovered
by explorers.
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In the early 19th Century they had a revolutionary idea in Germany.
Living things are
made of living
units
They started studying plants and animals at a microscopic level again.
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Both came up with a theory that said that all organisms come from a cell and
develop from there by the formation of new cells. CELL THEORY.
18381839
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All living things are formed by one or more
cells
A cell is the smallest and simplest living
thing.
All cells come from other pre-existing cells.
All cells can function independently,
although they work together in a coordnated
way when part of an organism.
One cell can perform all living functions : nutrition,
reproduction and interrelation
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How large are things really?
Microscopic objectsare meassured in:
μm = 10-3 mm
Nm = 10-6 mm
Not visible with a naked eye.
Eye resolution is 0,2 mm
If two objects are separated by a smaller distance, wewill see them as one.
Exercise 1:
If an object meassures1 mm, how manymicrometers does itmeassure? And howmany nanometers?
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Exercise 2
Paramecium caudatum magnified 300 times
3.6 cm
What is the size of the
paramecium?
Could we see it with
our naked eye?
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20th Century interest: The cell
1930 invention of
the Electron
Microscope:
uses electrons
instead of light.
Resolution 0,5 nm.
Allows to see cells in
detail.
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Electron Microscope Images
What do you think this is? And this?