一道遗传学题目,求解答
WhichofthefollowingisamajordifferenceinthemechanismsforgeneratingdiversityinTcellrece...
Which of the following is a major difference in the mechanisms for generatingdiversity in T cell receptors and B cell immunoglobulins (antibodies)?(8.0分)
A.Junctional diversity is generated only inT cell receptor genes
B.There are multiple variable region genesfor immunoglobulins but not for T cell receptors
C.Somatic recombination is seen only inimmunoglobulin genes
D. Somatic hypermutationis seen in immunoglobulin genes but not in T cell receptor genes
E.Junctional diversity is generated only inimmunoglobulin genes 展开
A.Junctional diversity is generated only inT cell receptor genes
B.There are multiple variable region genesfor immunoglobulins but not for T cell receptors
C.Somatic recombination is seen only inimmunoglobulin genes
D. Somatic hypermutationis seen in immunoglobulin genes but not in T cell receptor genes
E.Junctional diversity is generated only inimmunoglobulin genes 展开
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首先,TCR和B细胞免疫球蛋白基因都能发生体细胞重组(Somatic recombination ),所以C错误。
其次,TCR和B细胞免疫球蛋白基因都包含多重可变区域(multiple variable region ),所以B错误。
再次,TCR和BCR多样性产生机制中都包含两个方面:组合多样性(combinational diversity )和连接多样性(Junctional diversity )。所以A、E错误。
最后,体细胞高频(Somatic hypermutationis )突变仅仅发生在已发生基因重排的成熟B细胞,这点也是和TCR基因的主要区别。即D选项正确。
所以答案选D。
其次,TCR和B细胞免疫球蛋白基因都包含多重可变区域(multiple variable region ),所以B错误。
再次,TCR和BCR多样性产生机制中都包含两个方面:组合多样性(combinational diversity )和连接多样性(Junctional diversity )。所以A、E错误。
最后,体细胞高频(Somatic hypermutationis )突变仅仅发生在已发生基因重排的成熟B细胞,这点也是和TCR基因的主要区别。即D选项正确。
所以答案选D。
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