General biologyLesson 1 of 3 in the course The Cell

Spontaneous Generation and Its Experimental Rejection

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

This lesson introduces spontaneous generation, an influential early explanation for how life begins, and follows the experiments that challenged it before Pasteur. Understanding these investigations shows how observation and controlled experiments can test scientific claims.

Spontaneous generation was the idea that living organisms could arise directly from nonliving matter. The ancient Greek philosopher Aristotle (384–322 BC) was among the earliest recorded scholars to describe the idea. He proposed that nonliving materials could produce life when they contained pneuma, or “spirit” or “breath.”

All flashcards

What is biogenesis?
The principle that new life arises from existing life.
What is a swan-neck flask?
A flask with a curved neck that permits air exchange while trapping many airborne contaminants.
What did Pasteur's gun-cotton air filtration show?
Microorganisms were present on material used to filter air.
What did an intact swan-neck flask control for?
It allowed air to reach the broth while limiting airborne microbes from reaching it.
What does Omne vivum ex vivo mean?
Life comes from life.

Quiz questions

  1. In Redi's experiment, what happened to meat that flies could not reach?Answer: Maggots did not appear on the protected meat.
  2. Why did Needham's brief boiling of broth leave his results open to question?Answer: Some microorganisms may have survived the brief heating and later multiplied.
  3. What did Pasteur find after filtering air through gun-cotton and examining it?Answer: Microorganisms were present on the material that had filtered the air.
  4. How did the curved neck of Pasteur's flask help test spontaneous generation?Answer: It let air enter while trapping many airborne particles and microorganisms.
  5. What did microbial growth after a swan-neck flask was broken support?Answer: Airborne contaminants could reach the broth and cause microbial growth.

Based on Microbiology by Nina Parker, Mark Schneegurt, Anh-Hue Thi Tu, Philip Lister, Brian M. Forster (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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