(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
(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.英语作文
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