Microscopes
Cells Alive!
Microscopes
Compound Light
Microscope
~ Uses two lenses to
magnify an object
~ Can magnify up to
2000X
Dissecting
Microscope
~ Is similar to a
magnifying
glass
~ Can magnify up
to 40X
Microscopes
Electron
Microscope
• This microscope
uses electrons
instead of light to
magnify objects.
~ Can magnify an
object 10,000 times
its normal size.
Scientists
Anton van
Leeuwenhoek
~ First to see and
describe bacteria,
yeast, and
“animalcules”
~ Nicknamed the
“Father of
Microbiology”
Scientists
Robert Hooke
~ 1660’s – looked at
cork under a simple
microscope
~ Named the
structures “cells”
after rooms in a
monastery
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Scientists
Brown & Dujardin
Scientists
1830 – cells contain
a nucleus and are
filled with a jelly like
substance
Thomas Schwann
~ All animal tissues are
made of cells
Matthieas Schleiden
~ All plant tissues are
made of cells
Together they
figured out…
~ 1830’s – all organisms
composed of cells
~ Basic building block of
living things
cytoplasm
Scientists
Rudolf Virchow
All cells come from
other LIVING cells
The Cell Theory
Three basic parts…
In the beginning…
Theory of
Spontaneous
Generation
(Abiogenesis)
A theory stating that
living organisms are
spontaneously
produced from nonliving matter
1. All organisms are
composed of cells
2. Cells are the basic
units of life
3. All cells come
from other cells
In the beginning…
Maggots arise from
decaying meat.
After a rainstorm,
frogs arise from
mud.
Flies arise from
horse manure.
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Then there was “light”…
Theory of
Biogenesis
The Maggot Experiments
Living cells can only
arise from other
living cells.
Francisco Redi -1668
The Maggots’ Experiment
Where do maggots
come from?
Puppies can only
come from other
dogs.
Tomatoes can only
come from tomato
seeds.
Jar 2
Jar 1 was left open
Jar 2 was covered with
netting
Jar 3 was sealed from
the outside
The Maggot Experiments
Jar 1
Redi put meat into three
separate jars.
The Maggot Experiments
Hypothesis: Maggots
come from flies.
Actual results of
experiment…
Jar 3
Jar 1: maggots
appeared
Jar 2: no maggots
appeared
Jar 3: no maggots
appeared
What did Redi discover?
The Maggot Experiments
Final Conclusions…
Life can only arise
from pre-existing life
In Conclusion…..
THE END!!!!
Have A Great
Day!!!
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