GRE阅读练习每日一篇(五十)_GRE阅读

　　explaining what causes the genetic mutation that leads to heart disease

　　discussing the importance of research on animals for the study of human disease

　　18. Which of the following drugs, if developed, would most likely be an example of the kind of drug mentioned in line 53?

　　A drug that stimulates the production of VLDL remnants

　　A drug that stimulates the production of LDL receptors on the liver

　　A drug that stimulates the production of an enzyme needed for cholesterol production

　　A drug that suppresses the production of body cells that use cholesterol

　　A drug that prevents triglycerides from attaching to VLDL s

　　19. The passage supplies information to answer which of the following questions?

　　Which body cells are the primary users of cholesterol?

　　How did scientists discover that LDL s are secreted from the liver in the form of a precursor?

　　Where in the body are VLDL remnants degraded?

　　Which body tissues produce triglycerides?

　　What techniques are used to determine the presence or absence of cell-surface receptors?

　　20. According to the passage, by studying the Watanabe rabbits scientists learned that

　　VLDL remnants are removed from the blood by LDL receptors in the liver

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