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Q. Cell arise from the pre-existing cells was stated by
(a) Haeckel
(b) Virchow
(c) Hooke
(d) Schleiden.
Ans. (b) Virchow
Explanation. Cells develop from pre-existing cells, according to Rudolf Virchow, who expanded Schleiden’s cell theory.
Spontaneous creation (also known as abiogenesis) was hypothesised by Schleiden and Schwann as a process for call origination. However, it was later disproved. In 1855, at the age of 34, Rudolf Virchow published his now-famous aphorism “Omnis cellula e cellula,” meaning “all cells come exclusively from pre-existing cells.” Virchow pioneered cellular pathology with this approach. All diseases, he said, involve some changes in normal cells; thus, all pathology is essentially cellular pathology. This realisation ushered in significant advancements in medical practice. It allowed for far more precise definitions of disease entities.
However, the portions of the hypothesis that had nothing to do with cell origins withstood scientific investigation are now largely accepted by the scientific community.
Modern Interpretation
Parts of current cell theory that are widely recognised include:
- One or more cells make up all known living entities
- By division, all live cells develop from pre-existing cells
- In all living creatures, the cell is the basic structural and functional unit
- The cumulative activity of separate cells determines an organism’s activity
- Within cells, energy flows (metabolism and biochemistry)
- DNA is present specifically in the chromosome, whereas RNA is found in the nucleus and cytoplasm of cells
- In creatures of comparable species, all cells have essentially the same chemical composition
History
While at Würzburg, Virchow developed the notion of cellular pathology. Diseases were thought to be caused by an imbalance of the body’s four fluids until the late 18th century (blood, phlegm, yellow bile and black bile). Later events in the complicated history of cell theory occurred while Virchow was still a youth. In 1858, he presented his fundamental presentation of the idea in a series of 20 lectures in his book Die Cellularpathologie in ihrer Begründung auf physiologische und pathologische Gewebelehre (Cellular Pathology as Based upon Physiological and Pathological Histology).
