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Place the marker on the sun within the image below.  

Drug A is an anticlotting agent that is chiefly metabolized by CYP1A2. It was found that patients who smoke >10 cigarettes per day received increased benefit of the drug at a given dose, relative to nonsmokers. This is despite a significantly lower serum concentration of the drug in smokers. Which of the following could best explain these observations?  

True or False: Phase I and Phase II xenobiotic metabolism are found in different compartments of the cell.

True or False: The FDA requires metabolic data in at least two different animal models for drug approval

Which of the following metabolic reactions causes the smallest change in solubility of a metabolism substrate?

Consider the following metabolic pathway and answer the question below:                                  Which of the following molecules best fits in box 23? (chemically, not physically)                                 

What enzyme transfers electrons from NADPH to the CYP40 heme proteins using two tightly bound flavin cofactors?

For the reaction below:                                      Which of the following products is the result of a tertiary radical intermediate in the oxygen rebound mechanism?                   

Unlike G-protein coupled receptors, the AH and PXR receptors are located in the cytoplasm. Why?  

An epileptic patient who was stabilized on carbamazepine (800 mg/day) became severely depressed and was prescribed fluoxetine (SSRI) to treat the patient’s depressive disorder. After two weeks, neurotoxicity became apparent that was more suggestive of serotonin syndrome than of carbamazepine toxicity. A measurement of serum levels of fluoxetine showed 4 times the typical serum concentration.  Carbamazepine is a known inducer of CYP3A4.  Fluoxetine is chiefly metabolized by CYP2D6. The physician is considering switching antiseizure medications but it took considerable trial and error with multiple drugs to get the patient’s seizures under control.  Which of the following has the greatest likelihood of causing the elevated fluoxetine levels?