Antibodies consist of four polypeptides, ________ heavy chains, and ________ light chains.

Antibodies consist of four polypeptides, ________ heavy chains, and ________ light chains.
 
  A) one / three
  B) two / two
  C) three / one
  D) four / four

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The main bonds present in the C domain of antigen-binding proteins are
 
  A) hydrogen bonds.
  B) intrachain disulfide bonds.
  C) ionic bonds.
  D) van der Waals forces.

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Class II MHC proteins have grooves with
 
  A) closed ends.
  B) open ends.
  C) both open and closed ends.
  D) neither open nor closed ends.

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TCRs associate with the adapter molecule
 
  A) CD3.
  B) CD28.
  C) Ig.
  D) Ig.

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The C domain of antigen-binding proteins functions to
 
  A) attach the antigen-binding domain to the cytoplasmic membrane.
  B) bind to the cytoplasmic membrane of foreign cells.
  C) complex multiple antigen-binding proteins together.
  D) bind to epitopes.