Question
When Pasteur tested the hypothesis of spontaneous generation. He compare the ability of a sterilize growth medium to produce a population of bacteria into different types of flask. One had a simple neck open on the outside the other had a goose neck and then also open to the environment, he expected that bacteria would appear in the class with the
Standard flask served as what
Standard flask served as what
Answers
GPT-4o mini
In Louis Pasteur's experiment to test the hypothesis of spontaneous generation, the standard flask with a simple neck (open to the environment) was used as a control. This flask was expected to show microbial growth because it was exposed to air and contaminants from the environment, allowing microorganisms to enter the growth medium.
In contrast, the flasks with the swan neck (or goose neck) design were designed to allow air exchange while preventing airborne microbes from reaching the sterile broth. The necks of these flasks trapped dust and microbes, which settled in the bends, effectively keeping the growth medium sterile.
Pasteur's experiment demonstrated that the growth of bacteria in the standard flask was due to contamination from the air, thus providing evidence against the theory of spontaneous generation and supporting the idea that microorganisms come from existing microorganisms, not from non-living matter.
In contrast, the flasks with the swan neck (or goose neck) design were designed to allow air exchange while preventing airborne microbes from reaching the sterile broth. The necks of these flasks trapped dust and microbes, which settled in the bends, effectively keeping the growth medium sterile.
Pasteur's experiment demonstrated that the growth of bacteria in the standard flask was due to contamination from the air, thus providing evidence against the theory of spontaneous generation and supporting the idea that microorganisms come from existing microorganisms, not from non-living matter.