Question Detail

MIC 121 Introductory Microbiology Objective Question
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Question

What was the significance of the swan neck flasks in Louis Pasteur's famous experiment?
Options
A They allowed air to enter the broth but trapped airborne particulate matter and bacteria in the bend.
Correct Answer
B They completely sealed the broth from the outside environment.
C They increased the rate of microbial growth by exposing more surface area to air.
D They prevented the broth from boiling, thus preserving initial microbes.
Correct Answer

Option A is the correct answer.

Detailed Explanation

The unique S-shaped curve of the swan neck flasks allowed air to freely reach the sterile broth, which proponents of spontaneous generation claimed was necessary for life. However, airborne dust and microorganisms were trapped in the bend of the neck, preventing them from reaching the broth, which remained sterile.

Hint

The shape of the neck was key to allowing one factor (air) in while keeping another (microbes) out.

Question Info

Course: MIC 121
Topic: Introductory Microbiology
Type: Objective
Difficulty: Not specified
Question 170 of 984
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