CYP1A1 and CYP1A2 Isoforms Quiz

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Questions and Answers

Which human CYP1A subfamily member is primarily responsible for the activation of the carcinogen aflatoxin B1?

  • CYP1A2 (correct)
  • CYP1B1
  • CYP1 pseudogene
  • CYP1A1

What is the function of the CYP1A subfamily in the metabolism of environmental carcinogens?

  • Conversion of procarcinogens to inactive compounds (correct)
  • Activation of inactive carcinogens
  • Inactivation of mutagenic compounds
  • Prevention of carcinogen bioactivation

Where is CYP1A1 primarily expressed?

  • Kidney
  • Brain
  • Liver
  • Intestine (correct)

Which compound is NOT metabolized by CYP1A2?

<p>Mirtazapine (D)</p> Signup and view all the answers

What is another name for CYP1A1?

<p>Aromatic hydrocarbon hydroxylase (A)</p> Signup and view all the answers

Which CYP2 isoform represents only approximately 4% of total hepatic P450 isoforms?

<p>CYP2A6 (A)</p> Signup and view all the answers

Which cytochrome P450 isoform is expressed primarily in extrahepatic tissues such as kidney, adrenal, brain, uterus, breast, ovary, and intestine?

<p>CYP2C8 (D)</p> Signup and view all the answers

Which cytochrome P450 isoform metabolizes approximately 15% of clinically relevant drugs and is involved in metabolizing endogenous compounds such as steroids, melatonin, retinoids, and arachidonic acid?

<p>CYP2C9 (B)</p> Signup and view all the answers

Which cytochrome P450 isoform is responsible for at least 30 different drug oxidations, representing approximately 21% of clinically important drugs?

<p>CYP2D6 (A)</p> Signup and view all the answers

Which cytochrome P450 isoform is expressed highest in nasal epithelium followed by lung and trachea with high interindividual variability?

<p>CYP2A13 (B)</p> Signup and view all the answers

Which cytochrome P450 isoform represents less than 1% of the total hepatic P450 isoforms and has a low level of expression in the liver?

<p>CYP2B6 (A)</p> Signup and view all the answers

Which cytochrome P450 isoform metabolizes arachidonic acid, lauric acid, 17beta-estradiol, estrone, ethinyl estradiol, and testosterone among others?

<p>CYP2B6 (C)</p> Signup and view all the answers

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