Heya Mates
Describe the History of Finding different types of Cell .......
Answers
тнe dιѕcovery oғ тнe cell ιѕ one oғ тнe мoѕт proмιnenт dιѕcoverιeѕ ιn тнe нιѕтory. decadeѕ ago, ѕcιenтιѕтѕ ғoυnd тнaт every lιvιng organιѕм ѕтarтѕ ιтѕ lιғe ғroм a ѕιngle cell. ιт ιѕ тнe вaѕιc ѕтrυcтυral υnιт oғ lιvιng organιѕмѕ. leт’ѕ go тнroυgн тнe нιѕтory and dιѕcovery oғ cell ιn deтaιlѕ.
an englιѕн reѕearcнer naмed roвerт нooĸe ιѕ credιтed wιтн тнe dιѕcovery oғ cell. ιn тнe year 1665, нe oвѕerved тнιn ѕlιceѕ oғ corĸ (aparт вarĸ oғ a тree) υnder a мιcroѕcope and ѕaw нoneycoмв ѕтrυcтυreѕ. тнe ѕlιceѕ oғ corĸ appeared lιĸe ѕмall coмparтмenтѕ wнιcн were ғυrтнer ѕeparaтed вy a wall. even тнoυgн нe oвѕerved dead cellѕ oғ тнe corĸ, нe dιѕcovered тнe вυιldιng вlocĸѕ oғ lιғe. and roвerт нooĸe coιned тнe тerм “cell”. laтer, мany ѕcιenтιѕтѕ oвѕerved and ѕтυdιed aвoυт тнe cell and ιтѕ coмponenтѕ. тнey alѕo developed тнe cell тнeory.
dιѕcovery oғ cell- read aвoυт wнo dιѕcovered cellѕ aѕ ιт waѕ credιтed ιn тнe naмe oғ an englιѕн reѕearcнer roвerт нooĸe and ιѕ тнe вaѕιc ѕтrυcтυral & ғυncтιonal υnιт oғ lιvιng тнιngѕ.
aѕ вrιcĸ ιѕ тo тнe вυιldιng, тнe cell ιѕ тo вody. тнe cell мaĸeѕ anyтнιng alιve. ιт ιѕ ѕelғ-ѕυғғιcιenт тo carry oυт тнe enтιre ғυndaмenтal ғυncтιonѕ oғ an organιѕм. тнe cell ιѕ тнe υnιт тнaт enaвleѕ a lιvιng organιѕм тo do all ιтѕ ғυncтιonѕ wнιcн a non-lιvιng тнιng lacĸѕ.
cellѕ are coмpleх and тнeιr coмponenтѕ perғorм every ғυncтιon ιn a lιvιng вeιng. тнey are oғ dιғғerenт ѕнapeѕ and ѕιzeѕ, preттy мυcн lιĸe вrιcĸѕ oғ тнe вυιldιngѕ. oυr вody ιѕ мade υp oғ cellѕ oғ dιғғerenт ѕнapeѕ and ѕιzeѕ. cellѕ are тнe loweѕт level oғ organιzaтιon ιn every lιғe ғorм. ғroм organιѕм тo organιѕм, тнe coυnт oғ cellѕ мay vary. нυмanѕ нave тнe nυмвer oғ cellѕ coмpared тo тнaт oғ вacтerιa.
нσρє тнιѕ ωιℓℓ нєℓρ уσυ ✿◕‿◕✿
Heya dear matey
While the invention of the telescope made the Cosmos accessible to human observation, the microsope opened up smaller worlds, showing what living forms were composed of. The cell was first discovered and named by Robert Hooke in 1665. He remarked that it looked strangely similar to cellula or small rooms which monks inhabited, thus deriving the name. However what Hooke actually saw was the dead cell walls of plant cells (cork) as it appeared under the microscope. Hooke’s description of these cells was published in Micrographia. The cell walls observed by Hooke gave no indication of the nucleus and other organelles found in most living cells. The first man to witness a live cell under a microscope was Anton van Leeuwenhoek, who in 1674 described the algae Spirogyra. Van Leeuwenhoek probably also saw bacteria.
Formulation of the Cell Theory
In 1838, Theodor Schwann and Matthias Schleiden were enjoying after-dinner coffee and talking about their studies on cells. It has been suggested that when Schwann heard Schleiden describe plant cells with nuclei, he was struck by the similarity of these plant cells to cells he had observed in animal tissues. The two scientists went immediately to Schwann’s lab to look at his slides. Schwann published his book on animal and plant cells (Schwann 1839) the next year, a treatise devoid of acknowledgments of anyone else’s contribution, including that of Schleiden (1838). He summarized his observations into three conclusions about cells:
The cell is the unit of structure, physiology, and organization in living things.
The cell retains a dual existence as a distinct entity and a building block in the construction of organisms.
Cells form by free-cell formation, similar to the formation of crystals (spontaneous generation).
We know today that the first two tenets are correct, but the third is clearly wrong. The correct interpretation of cell formation by division was finally promoted by others and formally enunciated in Rudolph Virchow’s powerful dictum, Omnis cellula e cellula,: “All cells only arise from pre-existing cells”.
Modern Cell Theory
All known living things are made up of cells.
The cell is structural & functional unit of all living things.
All cells come from pre-existing cells by division. (Spontaneous Generation does not occur).
Cells contains hereditary information which is passed from cell to cell during cell division.
All cells are basically the same in chemical composition.
All energy flow (metabolism & biochemistry) of life occurs within cells.
As with the rapid growth of molecular biology in the mid-20th century, cell biology research exploded in the 1950’s. It became possible to maintain, grow, and manipulate cells outside of living organisms. The first continuous cell line to be so cultured was in 1951 by George Otto Gey and coworkers, derived from cervical cancer cells taken from Henrietta Lacks, who died from her cancer in 1951. The cell line, which was eventually referred to as HeLa cells, have been the watershed in studying cell biology in the way that the structure of DNA was the significant breakthrough of molecular biology.