Textbook Question
Label each of these thioglycolate tubes to indicate the oxygen requirements of the microbes growing in them.
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Ch. 6 - Microbial Nutrition and Growth
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302
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Table of contents
- Ch. 1 - A Brief History of Microbiology31
- Ch. 2 - The Chemistry of Microbiology28
- Ch. 3 - Cell Structure and Function39
- Ch. 4 - Microscopy, Staining, and Classification25
- Ch. 5 - Microbial Metabolism51
- Ch. 6 - Microbial Nutrition and Growth37
- Ch. 7 - Microbial Genetics51
- Ch. 8 - Recombinant DNA Technology21
- Ch. 9 - Controlling Microbial Growth in the Environment36
- Ch. 10 - Controlling Microbial Growth in the Body: Antimicrobial Drugs21
- Ch. 11 - Characterizing and Classifying Prokaryotes29
- Ch. 12 - Characterizing and Classifying Eukaryotes34
- Ch. 13 - Characterizing and Classifying Viruses, Viroids, and Prions23
- Ch. 14 - Infection, Infectious Diseases, and Epidemiology35
- Ch. 15 - Innate Immunity34
- Ch. 16 - Adaptive Immunity21
- Ch. 17 - Immunization and Immune Testing29
- Ch. 18 - Immune Disorders22
- Ch. 19 - Pathogenic Gram-Positive Bacteria25
- Ch. 20 - Pathogenic Gram-Negative Cocci and Bacilli28
- Ch. 21 - Rickettsias, Chlamydias, Spirochetes, and Vibrios25
- Ch. 22 - Pathogenic Fungi47
- Ch. 23 - Parasitic Protozoa, Helminths, and Arthropod Vectors44
- Ch. 24 - Pathogenic DNA Viruses23
- Ch. 25 - Pathogenic RNA Viruses30
- Ch. 26 - Applied and Industrial Microbiology29
- Ch. 27 - Microbial Ecology and Microbiomes22
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302Not the one you use?Change textbook
Chapter 6, Problem 2
Support or refute the following statement: Microbes cannot tolerate the low pH of the human stomach.
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Understand the statement: It claims that microbes cannot survive the acidic environment (low pH) of the human stomach. The stomach typically has a pH around 1.5 to 3.5, which is very acidic.
Recall that some microbes have adaptations to survive acidic conditions. For example, Helicobacter pylori is a bacterium known to colonize the stomach lining despite the low pH.
Consider the mechanisms microbes use to tolerate acidity, such as producing urease enzyme to neutralize acid locally or forming biofilms to protect themselves.
Evaluate evidence from microbiology studies showing that certain microbes not only survive but thrive in the stomach environment, indicating the statement is false.
Conclude by summarizing that while many microbes cannot tolerate low pH, some specialized microbes can, so the statement is refuted based on microbial adaptations and examples.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Microbial Acid Tolerance
Many microbes have developed mechanisms to survive acidic environments, such as proton pumps and acid-shock proteins. These adaptations allow certain bacteria to tolerate or even thrive at low pH levels, including those found in the human stomach.
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Immune Tolerance
Human Stomach pH and Microbial Environment
The human stomach typically has a very low pH (around 1.5 to 3.5), creating a harsh environment that inhibits most microbial growth. However, some microbes, like Helicobacter pylori, can survive and colonize this acidic niche by neutralizing stomach acid locally.
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Role of Microbes in the Stomach
Despite the acidic conditions, certain microbes play important roles in the stomach, including influencing digestion and immune responses. Understanding which microbes can survive and how they adapt is key to evaluating the statement about microbial tolerance to stomach acidity.
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Related Practice
Textbook Question
All cells require a source of ___________ for redox reactions.
Textbook Question
High temperature affects the shape of particular molecules. How does this affect the life of a microbe?
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Textbook Question
Describe the type of hemolysis shown by the pathogen Staphylococcus aureus pictured here.
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Textbook Question
A toxic form of oxygen,___________ oxygen, is molecular oxygen with electrons that have been boosted to a higher energy state.
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Textbook Question
“In the laboratory, a sterile inoculating loop is moved across the agar surface in a culture dish, thinning a sample and isolating individuals.” This statement describes which of the following?
a. Broth culture
b. Pour plate
c. Streak plate
d. Dilution plate
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