Xenobiotic, oxidative stress and antioxidants
Biochemistry · Topic 12
Source: NMC CBME Curriculum 2024 · Volume I · Biochemistry · Topic 12 · combined PDF page 168
Practice questions
- In the Labeo rohita study of sublethal bisphenol S exposure, which combination of findings most directly supported the authors’ conclusion that the fish experienced oxidative stress?
- Which molecule was measured as a lipid-peroxidation product in the BPS-exposed Labeo rohita study?
- A toxicology report finds increased protein carbonylation and MDA after metal exposure. Which interpretation best fits these results?
- In the chromium-plus-arsenic mouse study, which pattern was reported in the exposed group?
- A single antioxidant-enzyme activity changes after a xenobiotic exposure, but no damage markers are measured. Which conclusion is most defensible?
- Which set contains only antioxidant-defense biomarkers assessed in the BPS-exposed fish?
- In the supplied chromium-plus-arsenic study, what role is attributed to Nrf2?
- Which statement best distinguishes Nrf2 from the antioxidant enzymes measured in the xenobiotic studies?
- A mouse experiment reports that co-treatment with biochanin-A, coenzyme Q10, and phloretin reversed several chromium-plus-arsenic-associated biochemical changes. What is the most appropriate conclusion?
- Which sequence represents the three-stage plant xenobiotic-processing framework described in the supplied review?
- In the plant xenobiotic framework, which stage links a modified xenobiotic to another substance to increase its solubility?
- A plant stores or isolates a conjugated xenobiotic in a specific cellular location. Which stage does this illustrate?
- Which statement about the plant three-stage xenobiotic framework is most accurate?
- Which group of compounds is identified in the plant review as non-enzymatic antioxidants?
- Which statement best characterizes bisphenol S in the fish study?
- A report describes chromium and arsenic administered together to mice and finds increased renal metal burden. Which inference is justified from this design?
- Which conclusion about BPS toxicity is supported by the supplied fish study?
- The cardiovascular review describes which set of metals as toxic environmental or occupational exposures associated with oxidative stress?
- Which statement best reflects the physiological and pathological roles of ROS described in the cardiovascular review?
- A student argues that because oxidative stress is implicated in atherosclerosis, antioxidant supplementation must prevent cardiovascular disease. Which response is most scientifically appropriate?
- Which disease group is identified in the supplied review as having oxidative stress among its relevant pathophysiological processes?
- In the combined chromium-plus-arsenic mouse study, which set of findings provided evidence beyond biochemical antioxidant and lipid-damage assays?
- In the BPS-exposed fish, glutathione was assessed alongside antioxidant enzymes. Which classification best fits glutathione in this study?
- A plant xenobiotic is chemically altered before being linked to another substance and then stored in a cellular compartment. Which sequence correctly labels these events?
- Which pairing correctly matches a biomarker with the type of oxidative injury it reflects in the supplied studies?
- Which inference is best supported when a xenobiotic exposure is accompanied by altered SOD, catalase, GST, glutathione, and increased lipid-peroxidation markers?
- Which finding in the chromium-plus-arsenic mouse study most directly indicates altered renal exposure to the metals, rather than oxidative molecular damage?
- The plant review states that xenobiotics can increase ROS and damage cellular macromolecules. Which set names the macromolecule classes explicitly emphasized?
- Which statement accurately characterizes the BPS fish study's evidence level and tissue context?
- Which statement best captures how the supplied literature links xenobiotic metabolism with antioxidant defense in plants?
- The cardiovascular review describes oxidative stress as relevant to atherosclerosis and also notes physiological ROS functions. Which conclusion follows?
- Which combination of outcomes was reported to improve or reverse with antioxidant co-treatment in chromium-plus-arsenic-exposed mice?