Textbook Question
Superoxide dismutase:
a. Causes hydrogen peroxide to become toxic
b. Detoxifies superoxide radicals
c. Neutralizes singlet oxygen
d. Is missing in aerobes
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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
Describe the type of hemolysis shown by the pathogen Staphylococcus aureus pictured here.
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Observe the clear zones surrounding the bacterial colonies on the blood agar plate. These clear zones indicate the breakdown of red blood cells (RBCs) around the colonies.
Recall that hemolysis on blood agar is classified into three types: alpha-hemolysis (partial hemolysis with greenish discoloration), beta-hemolysis (complete hemolysis with clear zones), and gamma-hemolysis (no hemolysis, no change in the medium).
Note that the image shows distinct, transparent clear zones around the colonies, which means the RBCs have been completely lysed in those areas.
Identify this pattern as beta-hemolysis, which is characteristic of Staphylococcus aureus due to its production of hemolysins that completely lyse red blood cells.
Conclude that the type of hemolysis shown by Staphylococcus aureus in the image is beta-hemolysis, indicated by the clear, transparent zones around the bacterial colonies on the blood agar.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Hemolysis Types on Blood Agar
Hemolysis refers to the breakdown of red blood cells by bacterial enzymes on blood agar plates. There are three main types: alpha (partial, greenish discoloration), beta (complete clearing around colonies), and gamma (no hemolysis). Identifying hemolysis type helps differentiate bacterial species.
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Beta-Hemolysis Characteristics
Beta-hemolysis is characterized by a clear, transparent zone surrounding bacterial colonies on blood agar, indicating complete lysis of red blood cells. This type of hemolysis is typical of pathogens like Staphylococcus aureus and Streptococcus pyogenes, aiding in their identification.
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Staphylococcus aureus Identification
Staphylococcus aureus is a gram-positive cocci known for producing beta-hemolysis on blood agar. Its ability to completely lyse red blood cells is a key diagnostic feature, along with other tests like coagulase positivity, helping distinguish it from other Staphylococcus species.
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Related Practice
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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
Support or refute the following statement: Microbes cannot tolerate the low pH of the human stomach.
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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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Textbook Question
All cells recycle the essential element ___________ from amino acids and nucleotides.
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Textbook Question
Explain quorum sensing, and describe how it is related to biofilm formation.
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