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发布时间：2006-06-23 17:03     点击：

　　2. The passage suggests that a biologist who held the view described in the first sentence of the second paragraph would most probably also have believed which of the following?

　　(A) The rate of degradation of specific mRNA's has little effect on protein concentrations.

　　(B) The rate of degradation of specific mRNA's should be studied intensively.

　　(C) The rates of synthesis and degradation for any given mRNA are normally equal.

　　(D) Different mRNA's undergo degradation at widely varying rates.

　　(E) Most mRNA's degrade very rpaidly.

　　3. Which of the following best describes the relationship between the second and third paragraphs of the passage?

　　(A) The second paragraph presents arguments in support of a new theory and the third paragraph presents arguments against that same theory.

　　(B) The second paragraph describes a traditional view and the third paragraph describes the view that has replaced it on the basis of recent investigations.

　　(C) The third paragraph describes a specific case of a phenomenon that is described generally in the second paragraph.

　　(D) The third paragraph describes an investigation that was undertaken to resolve problems raised by phenomena described in the second paragraph.

　　(E) Both paragraphs describe in detail specific examples of the phenomenon that is introduced in the first paragraph.

　　4. The accumulation of concentrations of hemoglobin in red blood cells is mentioned in the passage as an example of which of the following?

　　(A) The effectiveness of simultaneous variation of the rates of synthesis and degradation of mRNA

　　(B) The role of the ribosome in enabling a parent cell to develop properly into a more specialized form

　　(C) The importance of activating the genes for particular proteins at the correct moment

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