GRE阅读练习每日一篇(五)_GRE阅读

　　18. The author states that research into the genetic control of morphogenesis has been impeded by

　　an incomplete understanding of biomolecular reactions that are highly complex

　　a lack of communication between scientists whose work could be complementary

　　a reluctance on the part of morphologists to share data with molecular biologists

　　a lack of research in the area of morphology

　　the unavailability of suitable research equipment

　　19. The major objective of the author s proposal is to

　　devise a technique for proving that abnormalities in morphology result from gene mutations

　　improve the procedures for organizing chemical and morphological data

　　increase the accuracy of measurements of cell populations and cell mobility

　　reduce the margin of error in the study of conformational changes of protein molecules

　　provide a plan for increasing knowledge about the influence of genes on morphogenesis

　　20. It can be inferred from the passage that some cells that have been isolated from an organism have the ability to

　　control morphogenesis

　　reform to make higher organisms

　　reorganize to form clusters of cells

　　regulate the transmission of light through the cell wall

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