分页标题
2011-09-14 14:41:00   来源：作文地带    双击单词自动翻译

　　(A) State legislators deciding about funding levels for a state-funded biological laboratory

　　(B) Scientists specializing in molecular genetics

　　(C) Readers of an alumni newsletter published by the college that Paul Gross attended

　　(D) Marine biologists studying the processes that give rise to new species

　　(E) Undergraduate biology majors in a molecular biology course

　　2. It can be inferred from the passage that the morphogenetic determinants present in the early embryo are

　　(A) located in the nucleus of the embryo cells

　　(B) evenly distributed unless the embryo is not developing normally

　　(C) inactive until the embryo cells become irreversibly committed to their final function

　　(D) identical to those that were already present in the unfertilized egg

　　(E) present in larger quantities than is necessary for the development of a single individual

　　3. The main topic of the passage is

　　(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

　　4. According to the passage, when biologists believed that the cells in the early embryo were undetermined, they made which of the following mistakes?

　　(A) They did not attempt to replicate the original experiment of separating an embryo into two parts.

　　(B) They did not realize that there was a connection between the issue of cell determination and the outcome of the separation experiment.

　　(C) They assumed that the results of experiments on embryos did not depend on the particular animal species used for such experiments.

　　(D) They assumed that it was crucial to perform the separation experiment at an early stage in the embryo’s life.

　　(E) They assumed that different ways of separating an embryo into two parts would be equivalent as far as the fate of the two parts was concerned.