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Transcript
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. 1 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. 2 Spontaneous Generation and the Discovery of the Cell Mrs. Keadle JH Science 400 BC 0 1590 1665 – 1670 1740 1770 1832 3 Spontaneous Generation and the Discovery of the Cell Mrs. Keadle JH Science 1838 1855 1860 1890 19301933 now 1953 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 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. 5 Spontaneous Generation and the Discovery of the Cell