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Name three groups of low G + C Gram-positive bacteria.
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Ch. 11 - Characterizing and Classifying Prokaryotes
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302
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TOC.tableOfContents
- 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
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Bauman 6th EditionCh. 11 - Characterizing and Classifying ProkaryotesProblema 5
Bauman 6th EditionCh. 11 - Characterizing and Classifying ProkaryotesProblema 5Capitolo 11, Problema 5
How is Halobacterium salinarum distinctive?
a. It is absolutely dependent on high salt concentrations to maintain its cell wall.
b. It is found in terrestrial volcanic habitats.
c. It photosynthesizes without chlorophyll.
d. It can survive 5 million rad of radiation.
Guida verificata passo dopo passo1
Step 1: Understand the organism Halobacterium salinarum. It is an extremophile archaeon known for thriving in environments with very high salt concentrations.
Step 2: Analyze option (a): Halobacterium salinarum requires high salt concentrations to maintain the integrity of its cell wall and overall cellular structure, which is a key characteristic of halophilic archaea.
Step 3: Consider option (b): Terrestrial volcanic habitats are typically associated with thermophilic or acidophilic organisms, not halophiles like Halobacterium salinarum.
Step 4: Evaluate option (c): While Halobacterium salinarum can perform a type of photosynthesis using bacteriorhodopsin (a pigment different from chlorophyll), this is a distinctive feature but not the primary defining trait related to its salt dependence.
Step 5: Review option (d): Resistance to extremely high radiation doses is characteristic of organisms like Deinococcus radiodurans, not Halobacterium salinarum.
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Halobacterium salinarum and Halophilicity
Halobacterium salinarum is an extremophilic archaeon that thrives in environments with very high salt concentrations, often above 20%. Its cellular structures, including the cell wall and membrane, require these conditions to maintain stability and function, making it obligately halophilic.
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Osmolarity Factors for Microbial Growth
Phototrophy without Chlorophyll
Unlike plants and many bacteria that use chlorophyll for photosynthesis, Halobacterium salinarum uses a pigment called bacteriorhodopsin to capture light energy. This pigment enables it to perform a form of phototrophy by pumping protons to generate ATP without traditional chlorophyll-based photosynthesis.
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05:58Pigments of Photosynthesis
Radiation Resistance and Habitat
While some microorganisms can survive extreme radiation, Halobacterium salinarum is not known for extraordinary radiation resistance. It is primarily found in hypersaline environments like salt lakes, not volcanic habitats, distinguishing its ecological niche and stress adaptations.
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02:55Radiation Mutagens
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