Laboratory Experiments in Microbiology (12th Edition) (What's New in Microbiology)
12th Edition
ISBN: 9780134605203
Author: Ted R. Johnson, Christine L. Case
Publisher: PEARSON
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Chapter 3, Problem 2CT
How could you determine whether the turbidity in your nutrient broth tube was from a mixture of different microbes or from the growth of only one kind of microbe?
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A microbiologist used the concept of enrichment culture to isolate aerobic and anaerobic nitrogen-fixing bacteria, sulfate-reducing bacteria, and sulfur-oxidizing bacteria. What kind of selective media could he haveused for isolating each of these four classes of microbes?
You are responsible for the bioremediation of soil contaminated by jet fuel. Your coworker suggests you fertilize the soil with nitrogen and phosphorus to promote the growth of naturally occurring hydrocarbon-degrading microbes. However, you just read about a new mixture of microbes sold in a slurry with nutrients and a surfactant. What data do you need to collect to decide which approach would be best? How will you obtain these data?
The term "turbidity" in microbiology refers to:
a cloudy appearance in broth, meaning microorganisms did grow
a cloudy appearance in broth, meaning microorganisms did not grow
a clear appearance in broth, meaning microorganisms did not grow
the clump of cells at the top of a broth
a clear appearance in broth, meaning microroganisms did grow
Chapter 3 Solutions
Laboratory Experiments in Microbiology (12th Edition) (What's New in Microbiology)
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- Microorganisms are needed in wastewater treatment facility to do the actual breakdown and removal of nutrients and organic matter in the waste matter. One day, the employee who is in-charge of the facility notice that as the time goes by after the wastewater was loaded into the medium the metabolic activity of the microbe cease to increase and remain stable instead. Within the context of our discussion, what could be the possible explanation for the employee’s observation?arrow_forwardYou were tasked to aseptically collect different environmental samples from a quarry site and process them back in the laboratory for microbial cultivation and analysis. After all the thorough experiments, you were only able to cultivate and study 36 microorganisms. However, based on the metagenomic analysis conducted, there are about 140 other species present in the samples collected. Why is this the case? Discuss and expound on the possible reasonarrow_forwardMicrobes are exposed to a wide variety of environmental factors that affect growth and survival. By giving two (2) examples, discuss how the microbial survival in various environmental conditions has been used to understand its ability to make flavorful and long shelf-life type of foods.arrow_forward
- Discuss the THREE (3) main stages crucial to microbial leaching of copper from a low-grade ore, indicating the reactions where necessary. In your answer, state ONE (1)example of a bacterium useful to this process.arrow_forward1) would you describe the contents of the soil-inoculated broth as being a “pure culture”? Why or why not? 2) How did the uninoculated broth differ in appearance from the broths inoculated with E. Coli and M. Luteus? And then how could you tell if a supposedly sterile, uninoculated broth was contaminated? Please explain in detail and highlight the important parts cuz I am confused and need help! Thanksarrow_forwardExplain the reasons why the Chinese Turnip cake would be easily spoiled if you found the condensed water on the inner side of the cover lid of the container, even though you put the cake in the refrigerator. Explain in term of the factors of microbes growth. Explain it detailedarrow_forward
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