题干

早在一百多年前,人们就开始了对遗传物质的探索历程.对此有关描述错误的是(    )

A:人们最初认为蛋白质是遗传物质,氨基酸的排列顺序可能蕴含遗传信息

B:格里菲斯通过肺炎双球菌的转化实验确定了转化因子就是DNA

C:沃森和克里克运用建构物理模型的方法阐明了DNA的分子结构

D:科学家使用同位素标记法证实了DNA是以半保留的方式进行复制的

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答案(点此获取答案解析)

B

同类题5

阅读下面图表,从每小题所给的A、B、C、D四个选项中选出一个最佳选项。

    There will be three kids movies in theaters. Let's know the main idea of them first.

The Snow Queen

    The Snow Queen tells the story of the Snow Queen who covered the world in ice, setting out to destroy (破坏) everything, including the family of the glassmaker Vegard. Luckily, Vegard and his wife were able to save their daughter Gerda and their son Kai before it was too late. But when Kai was discovered by the Snow Queen's servant (仆人), Gerda took a journey across the icy wonderland, facing difficulties and finding new friends to set Kai free, to beat the Snow Queen and warm the hearts of people everywhere.

Angels Sing

    As a child, Michael Walker wished every day could be Christmas. That continued, until a tragic accident broke down his holiday spirit. Thirty years later, Michael still can't feel any joy for Christmas, though encouragement comes from his playful wife (Connie Britton) and kind parents (Kris Kristofferson and Fionnula Flanagan). But when his young son (Chandler Canterbury) face a tragedy (悲剧), Michael needs to make amends (赔偿) with his past. A mysterious man named Nick (Millie Nelson) gives Michael a gift that can give him the courage to find the Christmas joy that he lost.

Adventures of the Penguin King

    Rex, a young King Penguin, has been away from his home for three years, learning to hunt in the wild oceans, but now he's back in Penguin City. His task: to find a wife, settle down and raise a chick. But can he survive in the bad conditions on an island at the bottom of the world?