Problem 11 In Pasteur's experiment would yo... [FREE SOLUTION]

Chapter 2: Problem 11

In Pasteur's experiment would you expect to see microbial growth in the bent loop of the flask? Explain your thinking.

Short Answer

Expert verified

Microbial growth would be expected in the bent loop but not in the broth.

Step by step solution

Understand Pasteur's Experiment

Louis Pasteur designed an experiment to determine whether microbial life could arise spontaneously. He used a broth inside a flask with a bent 'swan-neck' tube to allow air to enter but prevent particles from falling in and reaching the broth.

Recognize the Role of the Bent Loop

The bent loop or swan-neck shape of the flask鈥檚 tube was designed to trap dust and microorganisms from the air before they could reach the sterile broth. The curve in the neck acts as a barrier.

Predict Microbial Growth in the Bent Loop

Since the bent loop traps dust and microorganisms, these would accumulate in the loop rather than reaching the broth. Therefore, you would expect to see microbial growth in the bent loop.

Explain the Absence of Microbial Growth in the Broth

Since the microorganisms are trapped in the bent loop and do not reach the broth, no microbial growth would be observed in the broth itself as long as the swan neck remains in place.

Unlock Step-by-Step Solutions & Ace Your Exams!

Full Textbook Solutions
Get detailed explanations and key concepts
Unlimited Al creation
Al flashcards, explanations, exams and more...
Ads-free access
To over 500 millions flashcards
Money-back guarantee
We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Spontaneous Generation

Spontaneous generation is the idea that life can arise from non-living matter. This theory was widely believed until the 19th century. People thought that simple organisms like maggots, mold, or bacterial colonies could arise spontaneously under certain conditions.

Microbial Growth

Microbial growth refers to the increase in the number of microorganisms, such as bacteria, fungi, and algae. For growth to occur, microbes need favorable conditions like nutrients, moisture, and appropriate temperatures. In Pasteur's experiment, the broth inside the flask provided these conditions. However, without external contamination, the broth remained sterile.

Swan-Neck Flask

The swan-neck flask was a crucial part of Pasteur鈥檚 experiment. Its unique design allowed air to enter the flask but trapped airborne particles in its bend. This prevented microbes from reaching the nutrient-rich broth. Therefore, microbial growth occurred in the bent loop, not in the broth itself.

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Recommended explanations on Biology Textbooks

What do you think about this solution?

We value your feedback to improve our textbook solutions.

91影视

In Pasteur's experiment would you expect to see microbial growth in the bent loop of the flask? Explain your thinking.

Short Answer

Step by step solution

Understand Pasteur's Experiment

Recognize the Role of the Bent Loop

Predict Microbial Growth in the Bent Loop

Explain the Absence of Microbial Growth in the Broth

Key Concepts

Spontaneous Generation

Microbial Growth

Swan-Neck Flask

One App. One Place for Learning.

Recommended explanations on Biology Textbooks

Biological Structures

Chemistry of Life

Energy Transfers

Responding to Change

Heredity

Communicable Diseases

Study anywhere. Anytime. Across all devices.