2022年专八改错题集训内容 (11)

2022-01-12 08:14:00来源:网络

  新东方在线专四专八频道给大家整理的相关内容,希望能够对大家的专四专八考试备考有所帮助,更多有关专四专八的备考内容,欢迎随时关注新东方在线专四专八频道。

  One important outcome of the work on the expression of genes in developing embryos

  is sure to be knowledge that can help preventing birth defects. Just as promising (26)

  is the possibility of unraveling the complicated writing (27) of the brain. A mechanic

  gets valuable insight how an (28) automobile works by rebuilding car engines;

  similarly, neuroscientists can learn how the brain functions from (29) the way it is

  put together. The next step pursuing the (30) goal is to find out how the blueprint

  genes, the home box genes, control the expression of other genes that create the valves

  and piston of the working cerebral engine.

  The protein encoded by the latter genes could change the (31) stickiness of the

  cell surface, the shape of the cell or its metabolism to create the characteristic

  peculiar to, say, neurons or neural-crest cell. Surface proteins may be the (32)

  mechanism, whereby similar programmed cells stick together to form specific structures;

  they might also sense (33)the local environment to help the cell decide what is to do.

  Clarifying those mechanisms will engage the best talents in (34) embryology and

  molecular biology for some times to come. (35) What is perhaps the most intriguing

  question of all is if the brain is powerful enough to solve the puzzle of its own creation.

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