GRE阅读练习每日一篇(五)_GRE阅读

　　regulate the rate of tissue formation

　　21. It can be inferred from the passage that the study of the effects of genes on morphogenesis is best accomplished by observing

　　intact developing embryos

　　adult sea urchins

　　isolated living cells

　　groups of genetically mutated cells

　　cells from the same kink of tissue

　　22. According to the passage, it is difficult to study cells in most intact embryos because

　　morphogenetic events cannot be isolated

　　embryos die quickly

　　embryos are difficult to obtain

　　individual cells reaggregate too quickly

　　individual cells are difficult to see

　　23. Which of the following sequences best describes the author s suggestion for future research on morphogenesis?

　　Accumulation of data, simplification of language, explanation of morphogenesis

　　Dispersion of cells, evaluation of cell activity, development of an explanatory hypothesis

　　Classification of cell types, separation of cell, observation of cell activity

　　Observation of cell development, description of cell behavior, explanation at the molecular level

　　Differentiation of cell types, description of cell structure, analysis of molecular components

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