A compound sentence has
A. One independent clause only.
B. one independent clauses separated by a colon or a semi colon or a comma and a conjunction.
C. One independent clause and no dependent clauses
BCR复合物的组成成分为
A. mIg, CD3
B. IgM, CD79a/CD79b
C. IgD, CD79a/CD79b
D. mIg, CD79a/CD79b
E. mIg, IgA和IgG
传递B细胞活化第一信号的信号转导分子为
A. CD79a和CD79b
B. CD19和CD21
CD3和CD4
D. CD4和CD8
E. CD40和CD40L
BCR与抗原结合后不能直接传递抗原刺激信号,原因是
A. mIg与抗原结合的亲和力不高
B. mIg的L链胞内部分很短
C. mIgM的H链胞质区很短
D. mIgD的H链胞质区很短
E. mIgM和mIgD的H链胞质区很短
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