Extracellular Glycoproteins Quiz
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Questions and Answers

Which of the following is true about Leukosialin?

  • It interacts with C4b and C3b fragments
  • It safeguards cells from excessive complement system activation
  • It is a glycoprotein involved in cell adhesion
  • It is a major sialoglycoprotein on the surface of human T lymphocytes (correct)
  • What is the role of Decay-accelerating factor (DAF)?

  • It interferes with the conversion of C2 to C2a
  • It regulates the complement system on the cell surface (correct)
  • It blocks the formation of the membrane attack complex
  • It recognizes C4b and C3b fragments
  • How does DAF prevent the formation of the C3bBb C3 convertase of the alternative pathway?

  • By blocking the formation of the membrane attack complex
  • By recognizing C4b and C3b fragments
  • By limiting the amplification convertases of the complement cascade
  • By interfering with the conversion of factor B to Bb by factor D (correct)
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