题目内容

RNA形成局部双螺旋时,其碱基配对原则是( )

A-T,G-C
B. A-U,C-G
C. A-U,G-T
D. C-T,G-A
E. C-U,A-G

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关于DNA双螺旋结构模型的描述正确的是( )

A. 腺嘌呤的克分子数等于胞嘧啶的克分子数
B. 同种生物体不同组织的DNA碱基组成不同
C. 碱基对位于DNA双螺旋的外侧
D. 两股多核苷酸链通过A与T或C与G之间的糖苷键连接
E. 维持双螺旋结构稳定的主要因素是氢键和碱基堆积力

-Have you finished your first paper?-_____.Just half of it. How about you?

A. Not at all
B. Not likely
C. Not a bit
D. Not yet

-Excuse me. How much is the shirt?-_____.

A. Extra Large
B. 50 each
C. It sells well
D. Altogether there are 5

-The Art Festival is coming. We’re going to watch the play Twelfth Night.-______

A. That ‘s all right
B. Never mind
C. You’re welcome
D. Enjoy your time

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