Search results
Cell theory, fundamental scientific theory of biology according to which cells are held to be the basic units of all living tissues. First proposed by German scientists Theodor Schwann and Matthias Jakob Schleiden in 1838, the theory that all plants and animals are made up of cells marked a great.
- Rudolf Virchow
Rudolf Virchow (born October 13, 1821, Schivelbein,...
- Blood Cells
The function of the red cell and its hemoglobin is to carry...
- Rudolf Virchow
Explore the fascinating journey of cell theory development, from Anton van Leeuwenhoek's discovery of bacteria to Louis Pasteur's debunking of Abiogenesis. Learn how scientists like Robert Hooke, Matthias Schleiden, and Theodor Schwann contributed to the three major tenets of cell theory, shaping modern biology.
- 11 min
- Matthew McPheeters
- Thank you for the information! Can you point me towards where you found this information so I may research it?
- They do kind of sound similar. But one says all living things are made of cells, meaning that all living things must have cells. And the 2nd says c...
- According to the Kaplan MCAT books, it is not just focus on the tenents overall.
- Boiling of the broth kills all bacteria in the fluid since the microorganisms cannot handle the high heat. With a normal flask, particles containin...
The classical cell theory was proposed by Theodor Schwann in 1839. There are three parts to this theory. The first part states that all organisms are made of cells. The second part states that cells are the basic units of life.
The Scottish botanist Robert Brown (1773–1858) was the first to recognize the nucleus (a term that he introduced) as an essential constituent of living cells (1831). In the leaves of orchids ...
- Paolo Mazzarello
- mazzarello@igbe.pv.cnr.it
- 1999
- Early Observations
- The Development of The Cell Theory
- Reproduction and Inheritance
- Wilson, Edmund B.
- Modern Advances
- Bibliography
The invention of the microscope allowed the first view of cells. English physicist and microscopist Robert Hooke (1635–1702) first described cells in 1665. He made thin slices of cork and likened the boxy partitions he observed to the cells (small rooms) in a monastery. The open spaces Hooke observed were empty, but he and others suggested these sp...
In 1824 Frenchman Henri Milne-Edwards suggested that the basic structure of all animal tissues was an array of "globules," though his insistence on uniform size for these globules puts into question the accuracy of his observations. Henri Dutrochet (1776–1847) made the connection between plant cells and animal cells explicit, and he proposed that t...
Despite the work of Dumortier, the origins of new cells remained controversial and confused. In 1852 a German, Robert Remak (1852–1865), published his observations on cell division, stating categorically that the generation schemes proposed by Schleiden and Schwann were wrong. Based on his observations of embryos, Remak stated instead that binary f...
Premier cell biologist of the early twentieth century, Wilson described how a fertilized egg divides up into hundreds of cells to form an embryo and which parts of the body develop from which cells. His student Walter Sutton discovered the role of chromosomes as the units of heredity.
The modern understanding of cellular substructure began with the use of the electron microscope. Keith Porter (1912–1997) was a pioneer in this field and was the first to identify the endoplasmic reticulum and many elements of the cytoskeleton. The explosion of knowledge brought about by improvements in microscopy, biochemistry, and genetics has le...
Harris, Henry. The Birth of the Cell. New Haven, CT: Yale UniversityPress, 1999. Magner, Lois N. History of Life Sciences, 2nd ed. New York: Marcel Dekker, 1994.
1. Robert Hooke coined the term cell. He was inspired by monks rooms, which were called cells. 2. the modern cell theory is composed of three facts: a)all life is composed of one or more cells, b)a cell is a basic unit of life, and, c)all cells come from other cells. Hope this helps :)
- 8 min
- Sal Khan
The cellular theory was produced in two steps by Schleiden and Schwann (1838–1839) and then by Remak (1855) and Wirchow (1855–1858). This theory claimed that cells were universal and microscopic entities, constituting living beings and that a cell was always produced by the division of another cell. Since that period up to now, the cell has ...
