Prueba de selectividad Biología // Diseño experimental (Pasteur)

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Hoy Crisal nos hablará de una prueba de diseño experimental que nos puede salir en cualquier prueba de SELECTIVIDAD en el ámbito de BIOLOGIA. Nos basaremos en uno de los expertimentos más conocidos de PASTEUR.

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00:00 *Cristal introduces the topic: an exercise on experimental design based on Louis Pasteur's experiment.*
00:13 *Pasteur's experiment demonstrated life does not form spontaneously, but from pre-existing microscopic life.*
00:25 *Pasteur altered the flask's neck shape to isolate broth from external microbes, sterilizing the broth using heat.*
01:48 *To test his hypothesis, Pasteur allowed air to enter the flask, resulting in broth spoilage, proving life forms from existing organisms.*
02:42 *Different questions can guide experiments: Does life form spontaneously or from pre-existing life?*
03:10 *Hypotheses can assert life forms spontaneously or not; experiment results validate or refute these.*
03:39 *The independent variable is the flask manipulation by Pasteur, influencing air contact with the broth.*
04:18 *The dependent variable is the broth's condition, affected by air contact.*
05:00 *Results show microbial presence in straight-neck flasks; curved-neck flasks remain sterile.*
06:08 *Conclusion: life cannot form spontaneously, supporting life originates from existing forms.*
06:23 *Experimental design exercises have multiple valid, coherent responses; applicable across various regions.*

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