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.
2012
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.
1 Spontaneous Generation and the Discovery of the Cell Mrs. Keadle JH Science
Matthias Schleiden concluded Robert Hooke saw and described that all plant tissues are cells for the first time. composed of cells.
Antony von Leeuwenhoek was Theodore Schwann concluded the first to describe protists and that all animal tissues were bacteria. . made of cells. John Needham claimed that air had a life These statements were the force and could cause spontaneous beginning of the cell theory generation. Lazzaro Spallanzani disagreed and repeated Needham’s experiments but boiled the soup longer and used truly sealed conatianers.
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. 2 Spontaneous Generation and the Discovery of the Cell Mrs. Keadle JH Science
400 BC 0 1590 1665 – 1740 - 1832 1670 1770
3 Spontaneous Generation and the Discovery of the Cell Mrs. Keadle JH Science
1838 - 1860 - now 1930- 1953 1855 1890 1933
4 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 Walter Flemming was the first microscope. This allows for much scientist to study mitosis and higher magnification and unlocks a new describe chromosomes. world in cell study
Louis Pasteur ended the debate over spontaneous generation by using swan necked bottles that would allow in oxygen but
not microbes in the air. The earliest descriptions Robert Remak was able to of spontaneous observe cell division in animal generation date back to cells. at least the time of Aristotle. Rudolf Virchow completed the cell theory by stating that all cells come from other cells.
5 Spontaneous Generation and the Discovery of the Cell