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发布时间：2006-06-23 17:05     点击：

　　(D) The abnormal proliferation of a protein that threatens to make the cell cancerous

　　(E) The kind of evidence that biologists relied on for support of a view of mRNA synthesis that is now considered obsolete

　　5. To begin to control a disease caused by a protein deficiency, the passage suggests that a promising experimental treatment would be to administer a drug that would reduce

　　(A) only the degradation rate for the mRNA of the protein involved

　　(B) only the synthesis rate for the mRNA of the protein involved

　　(C) both the synthesis and degradation rates for the mRNA of the protein involved

　　(D) the incidence of errors in the transcription of mRNA's from genetic nucleotide sequences

　　(E) the rate of activity of ribosomes in the cytoplasm of most cells

　　6. According to the passage, which of the following best describes the current view on the relationship between the synthesis and the degradation of mRNA in regulating protein synthesis?

　　(A) Biologists have recently become convinced that the ribosome controls the rates of synthesis and degradation of mRNA.

　　(B) There is no consensus among biologists as to the significance of mRNA degradation in regulating protein synthesis.

　　(C) The concept of mRNA degradation is so new that most biologists still believe that the vital role in protein regulation belongs to mRNA synthesis.

　　(D) Degradation of mRNA is now considered to be the key process and mRNA synthesis is no longer believed to play a significant role.

　　(E) Degradation of mRNA is now considered to be as important as mRNA synthesis has been, and still is, believed to be.

　　7. According to the passage, which of the following can happen when protein synthesis is not appropriately regulated?

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