Textbook Question
____________________ is a recombination event that occurs during gamete formation in eukaryotes.
Ch. 7 - Microbial Genetics
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 7, Problem 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
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Key Concepts
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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.
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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.
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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.
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Related Practice
Textbook Question
Which of the following methods of DNA repair involves enzymes that recognize and correct nucleotide errors in unmethylated strands of DNA?
a. Light repair of T dimers
b. Dark repair of P dimers
c. Mismatch repair
d. SOS response
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Textbook Question
A gene for antibiotic resistance can move horizontally among bacterial cells by __________ , __________ , and __________ .
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Textbook Question
__________ are nucleotide sequences containing palindromes and genes for proteins that cut DNA strands.
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Textbook Question
In translation, the site through which tRNA molecules leave a ribosome is called the:
a. A site
b. X site
c. P site
d. E site
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Textbook Question
Describe how DNA is packaged in both prokaryotes and eukaryotes.
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