Question Detail

MIC 121 Introductory Microbiology Objective Question
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Question

What was the crucial design feature of Louis Pasteur's swan-neck flasks that allowed him to conclusively disprove spontaneous generation?
Options
A They were made of a special heat-resistant glass.
B They allowed air to reach the broth but trapped particulate matter and bacteria in the bend of the neck.
Correct Answer
C The flasks were completely sealed, preventing any air from entering.
D They contained a special chemical that inhibited microbial growth.
Correct Answer

Option B is the correct answer.

Detailed Explanation

The bend of the long swan neck trapped any particulate matter or bacteria present in the air, preventing them from reaching the nutrient broth. This allowed air (a component Needham thought essential for spontaneous generation) to contact the broth while keeping it sterile, thus disproving spontaneous generation.

Hint

Consider how the unique shape of the flask addressed the argument about 'vital force' in the air.

Question Info

Course: MIC 121
Topic: Introductory Microbiology
Type: Objective
Difficulty: Not specified
Question 183 of 984
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