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Iodine: Quiz


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Question 1: Iodine is rare in the ________ and Earth's crust; however, the iodides are very soluble in water and the element concentrates in seawater, where it occurs in greater concentrations than in rocks.
PlanetPlutoSolar SystemSun

Question 2: [38] The proposed mechanism of action is that iodide ion can function in gastric mucosa as an antioxidant reducing species that can detoxify poisonous reactive oxygen species, such as ________.
AntisepticEthanolHydrogen peroxideChlorhexidine

Question 3: Sodium iodide is especially useful in the Finkelstein reaction, because it is soluble in ________, while potassium iodide is poorly so.
SqualeneAcetoacetic acidAcetoneCholesterol

Question 4: ________ is formed as a side-product.
Hydrogen chloridePhosphoric acidPhosphinePhosphorous acid

Question 5: There are 37 known (characterized) ________ of iodine, but only one, 127I, is stable.
IsotopeAtomStable nuclideTechnetium

Question 6: Many organoiodine compounds exist, the simplest is ________, approved as a soil fumigant.
Carbon tetrachlorideChloroformMethyl iodideBromomethane

Question 7: The thyroid gland actively absorbs iodide from the ________ to make and release these hormones into the blood, actions which are regulated by a second hormone TSH from the pituitary.
BloodPlateletRed blood cellBlood plasma

Question 8: Organoiodine compounds are produced by marine life forms, the most notable being ________ (commonly called methyl iodide).
Methyl iodideChloroformBromomethaneCarbon tetrachloride

Question 9: Biologically active substances like the ________ are naturally occurring organoiodine compounds.
Endocrine systemNorepinephrineThyroid hormoneCortisol

Question 10: Thyroid hormones are phylogenetically very old molecules which are synthesized by most multicellular ________, and which even have some effect on unicellular organisms.


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