Antibodies Knowledge-Based Download PDF

Questions

1. 1.

   Which class of antibody is the most abundant in human blood serum and is uniquely capable of crossing the placenta to provide passive immunity to the developing fetus?

   • A) IgA
   • B) IgE
   • C) IgM
   • D) IgG
2. 2.

   Which mechanism of antibody-mediated immunity involves antibodies binding directly to surface proteins of viruses or bacterial toxins, thereby preventing them from attaching to and infecting host cells?

   • A) Agglutination
   • B) Precipitation
   • C) Complement activation
   • D) Neutralization
3. 3.

   Which biological process refers to the coating of a pathogen by antibodies to facilitate and enhance its recognition and ingestion by phagocytes?

   • A) Opsonization
   • B) Neutralization
   • C) Agglutination
   • D) Precipitation
4. 4.

   Which class of immunoglobulins is primarily responsible for mucosal immunity and is predominantly present in bodily secretions such as saliva, tears, and breast milk?

   • A) IgD
   • B) IgA
   • C) IgE
   • D) IgM
5. 5.

   Which structural region of an antibody molecule forms the antigen-binding site that confers its antigen specificity?

   • A) The constant region of the heavy chains
   • B) The disulfide bridges connecting the chains
   • C) The variable regions of the heavy and light chains
   • D) The carbohydrate moieties attached to the Fc region