Domanda del libro di testo
____________________ is a recombination event that occurs during gamete formation in eukaryotes.
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Ch. 7 - Microbial Genetics
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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Capitolo 7, Problema 9
The Ames test ___________.
a. uses auxotrophs and liver extract to reveal mutagens
b. s time intensive and costly
c. involves the isolation of a mutant by eliminating wild-type phenotypes with specific media
d. proves that suspected chemicals are carcinogenic
Guida verificata passo dopo passo1
Understand the purpose of the Ames test: it is a biological assay used to assess the mutagenic potential of chemical compounds by observing whether they cause mutations in the DNA of certain bacteria.
Recall that the Ames test uses auxotrophic strains of bacteria, which are mutants that cannot synthesize a particular nutrient (often histidine) and require it to be supplied in the medium.
Recognize that the test includes the use of liver extract (S9 mix) to simulate mammalian metabolism, as some chemicals become mutagenic only after metabolic activation.
Note that the test detects mutagens by measuring the rate at which the auxotrophic bacteria revert to prototrophy (ability to grow without the supplemented nutrient), indicating mutation.
Evaluate each answer choice based on these points: the correct description should mention the use of auxotrophs and liver extract to reveal mutagens, rather than claiming the test is time intensive, isolates mutants by eliminating wild types, or proves carcinogenicity directly.
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Ames Test Purpose and Principle
The Ames test is a biological assay used to detect chemical substances that cause mutations in DNA, indicating potential mutagenic and carcinogenic properties. It uses specially engineered bacteria to reveal whether a chemical can induce genetic mutations.
Video consigliato:
06:59
The Ames Test
Use of Auxotrophic Bacteria and Liver Extract
The test employs auxotrophic strains of bacteria that cannot grow without a specific nutrient unless a mutation restores this ability. Liver extract is added to simulate mammalian metabolism, which can activate pro-mutagens into mutagens, making the test more relevant to human exposure.
Video consigliato:
07:37Prototrophs vs. Auxotrophs
Interpretation and Limitations of the Ames Test
While the Ames test indicates mutagenic potential, it does not definitively prove carcinogenicity in humans. It is a rapid, cost-effective screening tool but requires further testing to confirm cancer risk, as not all mutagens cause cancer and vice versa.
Video consigliato:
06:59The Ames Test
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