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【单选题】
下列关于B型DNA双螺旋结构模型的叙述中哪一项是错误的A.
为右手螺旋,每个螺旋为10个碱基对
B.
两股链通过碱基之间的氢键相连
C.
两条链方向相反
D.
嘌呤碱和嘧啶碱位于螺旋外侧
E.
螺旋的直径为2nm
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