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The Cell Theory: Timeline

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Morgan Olympia

on 3 December 2013

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Transcript of The Cell Theory: Timeline

The Cell Theory: Timeline
Zacharias Jansen
(1595)
Anton van Leeuwenhoek
Robert Hooke
Matthias Schleiden
Born in Hamburg in 1804.
Became a lawyer and studied plants in his free time and determined plants were made of cells. (1838)
Robert Hooke (1665)
Anton van Leeuwenhoek
(1674-1683)
Matthias Schleiden
(1838)
Theodor Schwann (1839)
Rudolph Virchow (1855)
Louis Pasteur (1850)
Francisco Redi (1688)
Zacharias Jansen
Born in Middleburg, in the Netherlands, in 1588 and died in 1638.
His family made lenses for a living.
He made the first compound microscope by combining 2 convex lenses, it magnified between 3 to 9 times. (1595)
Born in 1632 in the Netherlands.
Self-taught with no formal degree.
Constructed his own simple microscopes with single lenses that could magnify up to 300x.
Born in 1635 in England
Got into Westminster School at age 13 and then went on to Oxford.
One of the first people to build a Gregorian reflecting telescope.
Sugested Jupiter rotates on its axis.
Was one of the first proponents of a theory of evolution.
Theodor Schwann
Was born in 1810
Was a "master microscopist" who studied animal tissue and found similar structures to what Schlieden had found.
Extended cell theory to animals and stated all living things were made of cells. (1839)
Rudolf Virchow
Born in 1821 in Pomerania, Prussia.
Used knowledge of cells to pove that your whole body does not get sick, just one cell.
He summarized the cell theory saying all cells come from pre-existing cells. (1855)
Louis Pasteur
Born in 1822 in Dole, France.
Performed an experiment that disproved spontaneous generation by boiling beef broth in a "swan neck" trap, a flask with a "long bending neck that traps dust particles and other contaminants before they reach the body of the flask." (1850)
Francisco Redi
Born in 1626 in Arezzo, Italy
Proved that maggots did not come from rotten meat by putting meat in a closed jar, helping to disprove spontaneous generation. (1668)
Summary
The cell theory is a theory that has been added to for hundreds of years by many scientists. It states that all living organisms are made up of pre-existing cells and
Questions
1. How did Janssen's, Hooke's, and Leewenhoek's work contribute to the work of the scientists that came after them?
3. Describe the concept of spontaneous generation. Why do you think it took such a long time for people to accept that this idea was incorrect?
5. The microscope and numerous experiments lead to the rejection of spontaneous generation. This idea had been accepted by most people, including scientists, for over 200 years. How does this demonstrate the true nature of science?
2. How would our lives be different if we had never realized the existence of microorganisms? Provide at least one example to support your answer.
4. How do you think the cell theory impacted later scientific discoveries? Explain your answer.
6. Review Pasteur's experiment. Relate his experiment to the scientific method.
a. What was Pasteur's question?
b. State a reasonable hypothesis based upon this question.
c. What was the independent variable in Pasteur's experiment? What was the dependent variable?
d. What did Pasteur conclude from his experiment?
7. Examine your timeline. How long did it take to develop the cell theory? What does this imply about the formulation of a theory?
8. Why do we still consider the cell theory a theory? Explain your answer.
Sources
Jansen:
"Molecular Expressions: Science, Optics and You - Timeline - Zacharias Janssen." Molecular Expressions: Science, Optics and You - Timeline - Zacharias Janssen. N.p., n.d. Web. 24 Nov. 2013.
Timline:
http://www.cpschools.com/Schools/OSM/theory.htm
http://www.softschools.com/timelines/cell_theory_timeline/96/
http://www.timetoast.com/timelines/the-cell-theory-timeline
http://www.britannica.com/EBchecked/topic/445964/Louis-Pasteur
Hooke:
"Robert Hooke Biography." Bio.com. A&E Networks Television, n.d. Web. 24 Nov. 2013.
"Famous Scientists." Science Blog RSS. N.p., n.d. Web. 24 Nov. 2013.
Leewenhoek:
"Famous Scientists." Science Blog RSS. N.p., n.d. Web. 24 Nov. 2013.
Redi:
http://www.microscopemaster.com/cell-theory.html
http://www.britannica.com/EBchecked/topic/494690/Francesco-Redi
Schwann:
http://scienceworld.wolfram.com/biography/Schwann.html
Pasteur:
http://www.britannica.com/EBchecked/topic/445964/Louis-Pasteur/281415/Spontaneous-generation
Virchow:
http://scienceworld.wolfram.com/biography/Virchow.html
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2603088/
I believe the cell theory gave scientists a better understanding of living organisms making it possible for them to make more accurate conclusions to their experiments because they no longer used spontaneous generation as an explanation for the creation of things allowing them to progress in the development of new ideas.
Janssen's work helped the work of scientists that came after him because without his work, scientists would not have microscopes to finish their experiments. Without Hooke's work, scientists would not even know about cells. Leewenhoek helped the scientists now by improving microscopes and discovering bacteria.

If we never realized the existence of micro organisms, we would live in a different world. One thing that would be different is medicine. Our medicine would be extremely out-dated.
Spontaneous generation was the idea that living organisms evolved from non-living things. It was an idea that people believed in. The reason why it took people so long to accept that it was wrong was because people did not have the resources to prove it wrong.
It took about 300 years to develop the cell theory. It took that long because it was made by 8 scientists that did not work together. They were each doing their own work, but all their work together made the theory.
We still consider the cell theory a theory because it's always correct. Every time scientists test it, it always comes out as the same answer as before. If it was proven wrong once, it would not be counted as a theory anymore, it would be a simple hypothesis.
In science, we are always discovering new things and sometimes old ideas are proved to be wrong. This is what happened with spontaneous generation, itas widely accepted because it seemed logical but as new information was brought to light, the new cell theory was created and even the cell theory has been changed and improved since the time of its creation.
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