UNIT 4 CHAPTER 3. Section 1: Cell Size, Microscopes, and The Cell Theory.
The Cell Theory Microscopes Provide the Windows to the World of the Cell.
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The Cell Theory Microscopes Provide the Windows to the World of the Cell
Transcript of The Cell Theory Microscopes Provide the Windows to the World of the Cell.
The Cell TheoryMicroscopes Provide the Windows to the World of the Cell
Anton Van Leeuwenhoek
(1600’s)
Credit for the first microscope
Looked at pond water and saw “wee beasties”
Robert HookeObserved plant stems, wood, and cork (1600’s)
He used a compound scope (series of lenses)
He was the first to use the term “cell”
What cell part did Hooke observe?
Cell Wall
Robert Brown (1833)
Observed that cells had a dark structure within plant cells
Brown observed the nucleus
Matthias Schleiden (1838)
Stated that all plants are made of Cells
Made many observations of plants around the area
Theodor Schwann (1839)
Stated that all animals are made of Cells
Observed many animal tissues
Rudolf Virchow (1855)Stated that all cells come from pre-existing cells
Cells arise from the division of pre-existing cells
Louis Pasteur (1859)Disproved the Theory of Spontaneous Generation
Cell TheoryCell Theory is the unifying theme in biology because it emphasizes the similarity of all living things
All organisms are composed of one or more cells.Cells are the smallest living units of all living organisms.Cells arise only by division of a previously existing cell.
Exceptions to the Cell Theory
Viruses – are not cellular
Mitochondria and chloroplast – each contain genetic material and can reproduce
