Cell Theory

Good Essays
Topics: Cell
Cell Theory

In biology, cell theory is a scientific theory that describes the properties of cells, the basic unit of structure in every living thing. The initial development of the theory, during the mid-17th century, was made possible by advances in microscopy; the study of cells is called cell biology.

Cell theory states that new cells are formed from pre-existing cells, and that the cell is a fundamental unit of structure, function and organization in all living organisms. It is one of the foundations of biology.

History:
The cell was discovered by Robert Hooke in 1665. He examined (under a coarse, compound microscope) very thin slices of cork and saw a multitude of tiny pores that he remarked looked like the walled compartments a monk would live in. Because of this association, Hooke called them cells, the name they still bear. However, Hooke did not know their real structure or function. Hooke's description of these cells (which were actually non-living cell walls) was published in Micrographia. His cell observations gave no indication of the nucleus and other organelles found in most living cells.

The first person to make a compound microscope was Zacharias Jansen, while the first to witness a live cell under a microscope was Antonie van Leeuwenhoek, who in 1674 described the algae Spirogyra and named the moving organisms animalcules, meaning "little animals". Leeuwenhoek probably also saw bacteria. Cell theory was in contrast to the vitalism theories proposed before the discovery of cells.

The idea that cells were separable into individual units was proposed by Ludolph Christian Treviranus and Johann Jacob Paul Moldenhawer. All of this finally led to Henri Dutrochet formulating one of the fundamental tenets of modern cell theory by declaring that "The cell is the fundamental element of organization".

The observations of Hooke, Leeuwenhoek, Schleiden, Schwann, Virchow, and others led to the development of the cell theory. The cell theory is

You May Also Find These Documents Helpful

  • Good Essays

    Cell theory

    • 689 Words
    • 3 Pages

    biology, cell theory is a scientific theory that describes the properties of cells, which are the basic unit of structure in all organisms and also the basic unit of reproduction. The initial development of the theory, during the mid-17th century, was made possible by advances in microscopy; the study of cells is called cell biology. Cell theory is one of the foundations of biology.The observations of Hooke, Leeuwenhoek, Schleiden, Schwann, Virchow, and others led to the development of the cell theory…

    • 689 Words
    • 3 Pages
    Good Essays
  • Best Essays

    Cell Theory

    • 2348 Words
    • 10 Pages

    Portfolio The Cell and Cell Theory [pic] The cell The word cell comes from the Latin word “cellula”, which means a small room. The cell is the smallest unit of a living organism, also known as “the building block of life”. Every living organism is consisted of a cell. There are bacteria (unicellular organisms), and multicellular organisms. There are different types of cells, prokaryotic and eukaryotic cells. All cells come from preexisting cells. “Every cell is self-maintaining;…

    • 2348 Words
    • 10 Pages
    Best Essays
  • Good Essays

    Cell Theory

    • 2905 Words
    • 12 Pages

    Cell Structure - Cell Organelles 1. What is cell theory? Cell theory asserts that the cell is the constituent unit of living beings. Before the discovery of the cell, it was not recognized that living beings were made of building blocks like cells. The cell theory is one of the basic theories of Biology. 2. Are there living beings without cells? Viruses are considered the only living beings that do not have cells. Viruses are constituted by genetic material (DNA or RNA) enwrapped by a protein…

    • 2905 Words
    • 12 Pages
    Good Essays
  • Good Essays

    Cell Theory

    • 450 Words
    • 2 Pages

    The Cell Theory The Cell Theory, formed by Anton van Leeuwenhoek, Robert Hooke, Matthias Schleiden, Theodore Schwann, and Rudolf Virchow, refers to the idea that cells are the basic unit of structure in every living organism. The theory justifies three principles: all living organisms are composed of one or more cells; the cell is the most basic unit of structure, function, and organization in all organisms; and all cells come from pre-existing, living cells. The formation of the cell theory started…

    • 450 Words
    • 2 Pages
    Good Essays
  • Good Essays

    The Cell Theory

    • 1080 Words
    • 5 Pages

    The CELL THEORY, or cell doctrine, states that all organisms are composed of similar units of organization, called cells. The concept was formally articulated in 1839 by Schleiden & Schwann and has remained as the foundation of modern biology. The idea predates other great paradigms of biology including Darwin's theory of evolution (1859), Mendel's laws of inheritance (1865), and the establishment of comparative biochemistry (1940). Ultrastructural research and modern molecular biology have…

    • 1080 Words
    • 5 Pages
    Good Essays
  • Good Essays

    Cell Theory

    • 456 Words
    • 2 Pages

    background knowledge relating to the current cell theory, the differences between prokaryotes and eukaryotes, and the structures and functions found within cells. Once this knowledge is known, a person is then able to give their opinion in the debate. In the 1800s, the cell theory was developed. This theory states that cells are found in all living things making them the basic units of life and that all cells come from other cells. In order to be classified as a cell, the object in question must be able…

    • 456 Words
    • 2 Pages
    Good Essays
  • Good Essays

    cell theory

    • 1598 Words
    • 5 Pages

    Weismann, who noted that two cell divisions were necessary to transform one diploid cell into four haploid cells if the number of chromosomes had to be maintained. In 1911 the American geneticist Thomas Hunt Morgan observed crossover in Drosophila melanogaster meiosis and provided the first genetic evidence that genes are transmitted on chromosomes. The term meiosis was introduced to biology by J.B. Farmer and J.E.S. Moore in 1905 Meiosis i/maɪˈoʊsɨs/ is a special type of cell division necessary for…

    • 1598 Words
    • 5 Pages
    Good Essays
  • Powerful Essays

    CELL THEORY STEM CELLS

    • 1530 Words
    • 4 Pages

    CELL THEORY – STEM CELLS Stem cells are a large focus of study in today’s biomedical world. “They are cells that exist in an undifferentiated state, and transform into differing tissue types depending on what the cells surrounding them are,“ (National Institute of Health, 2012). Stem cells have the remarkable potential to develop into many different cell types in the body during early life and growth. In addition, they also serve as an internal repair mechanism inside many tissues, dividing without…

    • 1530 Words
    • 4 Pages
    Powerful Essays
  • Powerful Essays

    cell theory

    • 4858 Words
    • 20 Pages

    Question 1 1 out of 1 points Items that are necessary for survival are called Answer Selected Answer: needs Correct Answer: needs Question 2 1 out of 1 points Materials that come from nature such as water, coal and timber are examples of Answer Selected Answer: natural resources Correct Answer: natural resources Question 3 0 out of 1 points The economy of the United States is often described as Answer…

    • 4858 Words
    • 20 Pages
    Powerful Essays
  • Good Essays

    History of Cell Theory As we all probably know today, every single living being is made up by cells – the building blocks of life. As much as we would like to take this fact for granted, we cannot help but acknowledge and remember the works and discoveries of earlier scientists which all contributed to our today's understanding of the cell theory. The cell theory being; all living things are composed of one or more cells, cells are organisms' basic units of structure and function, and cells only come…

    • 961 Words
    • 4 Pages
    Good Essays