The _____ test is used for detecting chemicals with carcinogenic potential.
Koch
Ames
mutation
cancer
lowa
The Correct Answer is B
A. Koch: Koch’s postulates are criteria for linking a microorganism to a disease and are unrelated to chemical carcinogenicity testing.
B. Ames: The Ames test uses bacteria to detect mutagenic potential of chemicals; because mutagens often correlate with carcinogens, the Ames test is widely used as a screen for carcinogenic potential.
C. Mutation: Mutation is a general term for DNA changes; while mutation assays detect genetic changes, the named specific screening test commonly used for carcinogenic potential is the Ames test.
D. Cancer: “Cancer test” is not a standard name for an assay used to screen chemicals for carcinogenic potential.
E. Iowa: Iowa is a proper noun (a U.S. state) and is not the name of a chemical carcinogenicity assay.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Element:
An element refers to a pure chemical substance such as carbon or nitrogen, not a complex organic molecule required for growth.
B. Macronutrient:
Macronutrients are required in large quantities but can often be synthesized or derived from other sources; the term does not imply inability to synthesize.
C. Compound:
This term is too broad and does not specify the nutrient’s essential nature or the organism’s inability to synthesize it.
D. Growth factor:
A growth factor is an organic compound, such as an amino acid, vitamin, or nucleotide base, that the organism must obtain externally because it cannot synthesize it.
E. Trace element:
Trace elements are inorganic minerals required in minute amounts for enzyme function, not organic nutrients that must be provided.
Correct Answer is C
Explanation
A. Obligate aerobes: Obligate aerobes require oxygen for growth and cannot grow in its absence.
B. Obligate anaerobes: Obligate anaerobes cannot tolerate oxygen and will not grow in its presence.
C. Facultative anaerobes: Facultative anaerobes can use oxygen for aerobic respiration when it is available but can switch to fermentation or anaerobic respiration in oxygen-free conditions, allowing growth in both environments.
D. Aerotolerant anaerobes: Aerotolerant anaerobes do not use oxygen but tolerate its presence and grow equally well with or without it; they do not gain energetic advantage from oxygen.
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