Download Spontaneous Generation and the Discovery of the Cell

Mrs. Keadle JH Science
Name _________________________________ Date ______________________ Period ______
Spontaneous Generation and the Discovery of the Cell
Using the information you read in “The Debate Over Spontaneous Generation” and “Discovery
of the Cell and Mitosis”, answer the following questions, and create a historical timeline.
1 Which of the following scientists gave us a modern understanding of cell reproduction
(mitosis)?
A Schleiden
B Schwann
C Virchow
D all of the above
Ashley repeated Francisco Redi’s experiment for a spontaneous generation project. She placed meat in
two identical jars. She placed a stopper in the top of one jar and left the other uncovered. After a few
days, Ashley observed young flies (maggots) on the meat in the open jar. There were no flies in the
sealed jar.
2 What hypothesis was Ashley trying to test?
A Decaying meat produces maggots
B Maggots prefer one type of meat over another.
C Maggots need a certain temperature to appear.
D Plastic wrap keeps meat from spoiling.
Create a timeline using the articles. You can cut out and paste each block in the correct location
on the timeline. You will tape the two pages together to complete the timeline.
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Spontaneous Generation and the Discovery of the Cell
Mrs. Keadle JH Science
Matthias Schleiden concluded
that all plant tissues are
composed of cells.
Theodore Schwann concluded
that all animal tissues were
made of cells.
Robert Hooke saw and described
cells for the first time.
Antony von Leeuwenhoek was
the first to describe protists and
bacteria. .
John Needham claimed that air had a life
force and could cause spontaneous
generation.
Lazzaro Spallanzani disagreed and repeated
Needham’s experiments but boiled the soup
longer and used truly sealed conatianers.
These statements were the
beginning of the cell theory
Zacharias Janssen creates the
first compound microscope using
lenses he created.
Francis Crick, James Watson, Maurice
Wilkins and Rosalind Franklin
simultaneously discover and describe
DNA for the first time.
Barthelemy Dumortier
observed the first evidence
of cell division in plants.
Francesco Redi challenged the
idea of spontaneous generation
using an experiment with meat
in sealed and unsealed
containers.
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Spontaneous Generation and the Discovery of the Cell
Mrs. Keadle JH Science
400 BC
0
1590 1665 –
1670
1740 1770
1832
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Spontaneous Generation and the Discovery of the Cell
Mrs. Keadle JH Science
1838 1855
1860 1890
19301933
now
1953
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Spontaneous Generation and the Discovery of the Cell
Mrs. Keadle JH Science
Leo Szilard, Ernst Rusk, and Max Knoll
design and build the first electron
microscope. This allows for much
higher magnification and unlocks a new
world in cell study
Walter Flemming was the first
scientist to study mitosis and
describe chromosomes.
Louis Pasteur ended the debate
over spontaneous generation
by using swan necked bottles
that would allow in oxygen but
not microbes in the air.
Robert Remak was able to
observe cell division in animal
cells.
Rudolf Virchow completed the
cell theory by stating that all
cells come from other cells.
The earliest descriptions
of spontaneous
generation date back to
at least the time of
Aristotle.
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Spontaneous Generation and the Discovery of the Cell