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  • Plant cell | Definition, Diagram, Model, Labeled, Characteristics . . .
    Plant cells, like animal cells, are eukaryotic, meaning they have a membrane-bound nucleus and organelles There are three primary types of plant cells: parenchyma, collenchyma, and sclerenchyma The following is a brief survey of some of the major characteristics of plant cells For a more in-depth discussion of cells, see cell
  • Cell theory | Definition, History, Importance, Scientists, First . . .
    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
  • DNA | Definition, Discovery, Function, Bases, Facts, Structure . . .
    DNA is an organic chemical of complex molecular structure found in all prokaryotic and eukaryotic cells It codes genetic information for the transmission of inherited traits The structure of DNA was described in 1953, leading to further understanding of DNA replication and hereditary control of cellular activities
  • Eukaryote | Definition, Structure, Facts | Britannica
    Eukaryote, any cell or organism that possesses a clearly defined nucleus The eukaryotic cell has a nuclear membrane that surrounds the nucleus, in which the well-defined chromosomes (bodies containing the hereditary material) are located Learn more about eukaryotes in this article
  • Red blood cell | Definition, Functions, Facts | Britannica
    Red blood cell, cellular component of blood that carries oxygen from the lungs to the tissues and gives vertebrates’ blood its characteristic color The mature human red blood cell is small, round, and biconcave Red blood cells also carry carbon dioxide, a waste product, to the lungs, where it is excreted
  • Eukaryotic vs. prokaryotic cells: Key differences explained
    The material inside both types of cells is called the cytoplasm All cells contain DNA In eukaryotes, DNA resides in a membrane-bound structure called the nucleus But in prokaryotes, DNA is circular and floats freely within the cytoplasm Finally, both types of cells contain ribosomes Ribosomes play a key role in assembling proteins
  • Virus | Definition, Structure, Facts | Britannica
    Virus, infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria Viruses possess unique infective properties and thus often cause disease in host organisms Learn about the history, types, and features of viruses
  • Nucleus | Definition, Function, Structure, Facts | Britannica
    Nucleus, in biology, a specialized structure occurring in most cells (except bacteria and blue-green algae) and separated from the rest of the cell by a double layer, the nuclear membrane The nucleus controls and regulates the activities of the cell (e g , growth and metabolism) and carries the genes





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