Evaluation

True or False

  1. ______ People over the age of 50 are more likely to have an allergic reaction to urushiols than people under 50.
  2. ______ T cells release cytokines which promote an allergic reaction, and also release enzymes to stop the reaction.
  3. ______ Human-to-human transmission of urushiols is rare.
  4. ______ You can be exposed to urushiols by handling garden tool that have previously come in contact with poison ivy.
  5. ______ As you get older the chances of having n allergic reaction to urushiols increases.
  6. ______ You always know immediately if you've been exposed to urushiols.
  7. ______ Many people come in contact with urushiols by petting their dogs.
  8. ______ Once exposed to urushiols, you cannot be infected again.
  9. ______ It may take a month to get over Rhus dermatitis.

Multiple choice

  1. Natural Products as defined for this topic are
    1. Products made by hand
    2. Synonymous with secondary metabolites
    3. Green
    4. Wholesome
  2. Which of the following characteristics allows urushiols to penetrate the membrane of cells?
    1. Large
    2. Small
    3. Hydrophilic
    4. Lipophilic
  3. What is the name of the molecules which urushiols bind to on the surface of the membrane to initiate an immune response?
    1. transport proteins
    2. cholesterol
    3. MHC I
    4. T cells
  4. The reaction to urushiols is referred to as a delayed type hypersensitivity reaction. Which of the following phases is not part of this reaction?
    1. Efferent phase
    2. Resolution phase
    3. Afferent phase
    4. Initiation phase

Short Answer

  1. Since urushiol is found in resin canals of phloem tissue, in which direction (up or down) would the urushiol be traveling?
  2. List three examples of plants in which urushiol is found.
  3. How can urushiol contact the skin if it is found inside resin canals?
  4. What is the type of resin in which urushiol is found?
  5. Can you be affected by urushiol if you come in contact with the pollen of one of these plants? Why or why not?
  6. Is urushiol usually a pure substance?
  7. What is the difference between a saturated and unsaturated alkyl chain? How does saturation relate to the allergic reaction experienced with urushiol?
  8. What is a catechol?
  9. What is the difference between the alkyl chain of poison ivy and the alkyl chain of poison oak?

Answer Key

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