作为生物体遗传信息的表达者的是（）。

[问答题]Practice 1　 Directions: Read the following article in which five people talk about AIDS. For Question 1 to 5, match the name of each person to one of the statements (A to G) given below. Mark your answers on ANSWER SHEET 1.　　Greg Louganis:　　These were the trials for the 1988 Olympics in Seoul, Korea. Until this dive, I had been ahead. But now, something else was more significant than winning. I might have endangered other divers’ lives if I have spilled blood in the pool. For what I knew--that few others knew--was that I was HIV-positive. AIDS forced me to stop diving; I had to quit diving professionally after the Olympics.　　Margaret Chart:　　It is reported that almost three million people in developing countries are now receiving drugs for HIV. This is an increase of almost one million people from two thousand and six. Still, the hope was to reach three million by two thousand and five. But antiretroviral therapy, or ART, alone will not solve the problem. For every two persons we manage to provide them with ART, another five persons get infected. So again, we cannot underestimate the power of prevention.　　Paula Green:　　The disease robs the body of its natural defenses against infections. Almost seventy-five percent of people receiving HIV drugs are in Africa. The drugs help patients live longer without developing AIDS. An estimated nine million seven hundred thousand people in low and middle income countries were in need of HIV treatment last year. However, by the end of the year, just over thirty percent of them were getting it.　　Raymond Chow:　　Price reductions can be a main method to let more people with HIV, including more pregnant women, receive the drugs. Also, delivery systems should be redesigned to better serve individual countries and smaller health centers. And treatments should be simpler than in the past.　　William Wang:　　Huge barriers still remain in dealing with the AIDS epidemic. Getting patients to stay on their therapy is difficult. There are still large numbers of people who do not get tested for H1V. And there are many others who get tested too late and die within months. What’s more, there is not enough joint treatment of HIV and the related infections that most often kill AIDS patients. And still another problem is the shortage of health care workers in the developing world.　　Now match each of the items (1 to 5) to the appropriate statement.　　Note: There are two extra statements.　　Statements　　

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[单选题]作为生物体遗传信息的表达者的是（）。

[单选题]作为生物体遗传信息的表达者的是()。

[填空题]由（）分子构成的基因负责将亲代特征的遗传信息传递给子代，并决定了蛋白质分子的（），从而决定了生物体的性状。

[名词解释题]遗传信息表达结构系统

[判断题]生物体中遗传信息的流动方向只能由DNA-RNA，不能由RNA-DNA。

[填空题]遗传信息的表达受到严格的调控，包括（）即按一定的时间顺序发生变化和（）即随细胞内外环境的变化而改变。

[填空题]遗传信息的表达受到严格的调控，包括（）即按一定的时间顺序发生变化和（）即随细胞内外环境的变化而改变。

[单选题]基因表达时，遗传信息的基本流动方向是（）。

[单选题]基因表达时，遗传信息的流动方向和主要过程是（）

[单选题]基因表达时，遗传信息的基本流动方向是（）。