多项选择题

慢慢加热天然DNA溶液,260nm处的紫外吸收显著增加,出现这种现象的原因是()

A.水分蒸发,DNA溶液浓缩
B.DNA双链解链变成单链
C.出现了碱基堆积
D.碱基解堆积

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单项选择题
Which of the following is not true of Intel?()

A.Intel is one of the biggest tech companies in the world.
B.Recruiters of Intel have a strong interest in students majored in engineering,management and linguistics.
C.Intel makes many products,such as semi-conductor and chipsets.
D.Intel offers a variety of internships and rotational programs to give students a taste of various departments.

问答题
一个DNA的相对分子质量为多少时,它的长度可达到16.4nm?
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