Why would someone allergic to pecans want to avoid other tree nuts as well?
What will be an ideal response?
Allergens may share antigenic features. This means that a sensitizing exposure to one allergen may generate a cross-reactivity to other related allergens. For example, a person may only ever have been exposed to pecans, but the generated IgE antibodies may cross-react with antigens in walnuts, almonds, and cashews, rendering the patient allergic to all of those foods even if they have never been directly exposed to them. For this reason, a person who reacted against one tree nut would be advised to avoid all tree nuts as a precaution.
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Amoebae move by crawling over a surface (cell crawling), which involves _____
A) growth of actin filaments to form bulges in the plasma membrane B) setting up microtubule extensions that vesicles can follow in the movement of cytoplasm C) reinforcing the pseudopod with intermediate filaments D) cytoplasmic streaming
A pair of shared valence electrons is referred to as a(n):
A. ionic bond. B. hydrogen bond. C. van der Waals interaction. D. covalent bond. E. hydrophobic effect.
The apparent Vmax of dihydropteroate synthetase will _____________ when sulfanilamide is present while the Km of this enzyme will ______________
A. decrease / increase B. not change / increase C. decrease / decrease D. not change / decrease E. not change / not change
Which of the following may result in muscular weakness?
a. deficiencies in phosphorus and calcium b. deficiencies in iodine and iron c. deficiencies in iron and manganese d. deficiencies in phosphorus and potassium