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КРОК / KROK
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At a pharmaceutical factory, an alkaloid must be extracted from a herbal raw material. What would ensure effective extraction of this substance?
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What is the effect of electron-accepting substituents (type II substituents) on the course of electrophilic substitution (SE) reactions in arenes?
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What electrode can be used as an indicator electrode in titration of bases?
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A patient with arterial hypotension accompanied by collapse was administered phenylephrine hydrochloride to increase the blood pressure. What receptors are stimulated by this drug?
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What is characteristic of benign tumors?
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A 54-year-old man with 4-year-long history of chronic glomerulonephritis and 2-year-long history of persistent arterial hypertension made an appointment with a doctor. What substance synthesized in the kidneys plays an important role in the development of arterial hypertension in this patient?
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What method of chromatographic analysis can be used for separation, identification, and quantification of methanol and ethanol in a mixture?
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What structures of a flower originate from the stem?
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A bodybuilder athlete came to a pharmacy complaining of hyperthermia. To improve his athletic performance, he used the banned doping compound 2,4-dinitrophenol that uncouples oxidative phosphorylation. What effect of this compound on mitochondria can explain these symptoms?
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After examination, a child was diagnosed with scarlet fever. What microorganism is the causative agent of this disease?
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