Pasteur Used Swan-Neck Flasks in His Experiments to Test the Validity

question 48

Multiple Choice

Pasteur used swan-neck flasks in his experiments to test the validity of spontaneous generation.Suppose that after allowing the flasks to sit for a day, he had tilted one of these flasks so that the sterile broth entered the swan neck.Suppose he had then tilted the flask back to allow the broth to settle back into the round bowl of the flask before leaving it to sit undisturbed for another few days.What would have happened, and how would these results have affected conclusions about spontaneous generation?

• A) The broth would have become cloudy from growth of microbes present in the flask neck, and that would have supported the idea that life comes from preexisting life.
• B) The broth would have become cloudy from growth of microbes present in the flask neck, and that would have supported the concept of spontaneous generation.
• C) The broth would have become cloudy as the result of microbes present in the original broth, and that would have supported the idea that life comes from preexisting life.
• D) The broth would have remained clear as the result of sterilization by high heat, and that would have supported the idea that life comes from preexisting life.
• E) The broth would have remained clear as the result of sterilization by high heat, and that would have supported the concept of spontaneous generation.

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