enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Cell theory - Wikipedia

    en.wikipedia.org/wiki/Cell_theory

    From these conclusions about plants and animals, two of the three tenets of cell theory were postulated. 1. All living organisms are composed of one or more cells 2. The cell is the most basic unit of life. Schleiden's theory of free cell formation through crystallization was refuted in the 1850s by Robert Remak, Rudolf Virchow, and Albert ...

  3. Evolution of cells - Wikipedia

    en.wikipedia.org/wiki/Evolution_of_cells

    The eukaryotic cell seems to have evolved from a symbiotic community of prokaryotic cells. DNA-bearing organelles like mitochondria and chloroplasts are remnants of ancient symbiotic oxygen-breathing bacteria and cyanobacteria, respectively, where at least part of the rest of the cell may have been derived from an ancestral archaean prokaryote ...

  4. Cellularization - Wikipedia

    en.wikipedia.org/wiki/Cellularization

    In evolutionary biology, the term cellularization (cellularisation) has been used in theories to explain the evolution of cells, for instance in the pre-cell theory, [1] [2] [3] dealing with the evolution of the first cells on this planet, and in the syncytial theory [4] attempting to explain the origin of Metazoa from unicellular organisms.

  5. History of cell membrane theory - Wikipedia

    en.wikipedia.org/.../History_of_cell_membrane_theory

    Cell theory has its origins in seventeenth century microscopy observations, but it was nearly two hundred years before a complete cell membrane theory was developed to explain what separates cells from the outside world. By the 19th century it was accepted that some form of semi-permeable barrier must exist around a cell.

  6. Eukaryogenesis - Wikipedia

    en.wikipedia.org/wiki/Eukaryogenesis

    According to the theory of symbiogenesis (also known as the endosymbiotic theory) championed by Lynn Margulis, a member of the archaea gained a bacterial cell as a component. The archaeal cell was a member of the Asgard group. The bacterium was one of the Alphaproteobacteria, which had the ability to use oxygen in its respiration.

  7. Theodor Schwann - Wikipedia

    en.wikipedia.org/wiki/Theodor_Schwann

    The cell is the unit of structure, physiology, and organization in living things. [32] The cell retains a dual existence as a distinct entity and a building block in the construction of organisms. [32] By the 1860s, these tenets were the accepted basis of cell theory, used to describe the elementary anatomical composition of plants and animals. [3]

  8. AOL

    www.aol.com/news/photo-collection-end-us...

    AOL

  9. Timeline of the history of genetics - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_the_history_of...

    In 1871 he isolated cell nuclei, separated the nucleic cells from bandages and then treated them with pepsin (an enzyme which breaks down proteins). From this, he recovered an acidic substance which he called "nuclein". [1] 1880–1890: Walther Flemming, Eduard Strasburger, and Edouard Van Beneden elucidate chromosome distribution during cell ...