题目内容

下列大分子中需要利用mRNA为模板进行合成的是（）。

A. 糖类
B. 脂类
C. 核酸
D. 蛋白质

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鸡蛋煮熟后，蛋白质变性失活，这是由于高温破坏了蛋白质的（）

A. 肽键
B. 肽链
C. 空间结构
D. 分子量

细胞中有哪些脂质？举例说明它们在生命活动中的重要作用。（列出三种即可）

Watch theinterview with Audrey Hepburn and choose the best answer for the following questions.1. Before going to Ethiopia,Audrey Hepburn felt ________________.

A. nervous about what she's going to see
B. afraid of going there
C. emotionalabout what she's going to see
D. eager to go there

Watch the interview with Audrey Hepburn and choose the best answer for the following questions.2. Audrey Hepburn left Ethiopia with a feeling of __________________.

A. hopelessness
B. encouragement
C. depression
D. sadness