試題詳解

17. Which of the following statements about T cell receptors (TCRs) and their gene rearrangement are correct?(Select all that apply.)
(A) TCRs aree composed of either two polypeptide chains: a/β (alpha/beta) or y/δ (gamma/delta).
(B) The variable region of the a-chain is assembled from V, D, and JI gene segments.
(C) Gene rearrangement occurs at the DNA level.
(D) Both a- and β-chains have approximately 10 V gene segments
(E)DNA recombination isa each. (J) DNA recombination is a key mechanism that enables the immune system to recognize a vast array of antigens.