北美gre考试阅读真题解析(A)_GRE阅读

　　17. With which of the following statements concerning the stiffening of aging tissues would the author most likely agree?

　　 It is caused to a large degree by an increased rate of cell multiplication.

　　 It paradoxically both helps and hinders the longevity of proteins in the human body.

　　 It can be counteracted in part by increased ingestion of glucose-free foods.

　　 It is exacerbated by increased enzymatic glycosylation.

　　 It probably involves the nonenzymatic glycosylation of proteins.

　　18. According to the passage, which of the following statements is true of the process that discolors and toughens foods?

　　 It takes place more slowly than glycosylation in the human body.

　　 It requires a higher ratio of glucose to protein than glycosylation requires in the human body.

　　 It does not require the aid of enzymes to attach glucose to protein.

　　 It proceeds more quickly when the food proteins have a molecular structure similar to that of crystallin proteins.

　　 Its effectiveness depends heavily on the amount of environmental moisture.

　　19. According to the passage, which of the following is characteristic of enzymatic glycosylation of proteins?

　　 AGEs are formed after a period of months or years.

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