It can be inferred from the passage that the morphogenetic determinants present

游客2025-02-26 37

问题 It can be inferred from the passage that the morphogenetic determinants present in the early embryo are______ [br] The main topic of the passage is______

选项 A、the early development of embryos of lower marine organisms
B、the main contribution of modern embryology to molecular biology
C、the role of molecular biology in disproving older theories of embryonic development
D、cell determination as an issue in the study of embryonic development
E、scientific dogma as a factor in the recent debate over the value of molecular biology

答案 D

解析 D is the best answer. In identifying the main topic of the passage, you must consider the passage as a whole. In the first paragraph, the author provides a historical context for the debate described in the second paragraph, concerning when and how the determination of embryo cells takes place. The third and forth paragraphs provide a specific example of the “Recent discoveries in molecular biology” (lines 28-29) that may lead to the resolution of that debate.

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