GRE阅读练习每日一篇(五)
<p> 编辑点评： <span word="GRE">GRE</span>阅读的方法相信大家已经积累了很多了，本文就为大家提供一些<span word="GRE">GRE</span>阅读的材料，大家来练一练，把平时学到的东西运用到实际中，也多多积累词汇和句子，提高自己的阅读能力。</p><p> 每天做一些标准的<span word="GRE">GRE</span>阅读练习，有助于大家在<span word="GRE">GRE</span>考试的复习过程中不断地进行练习和总结。希望大家在进行<span word="GRE">GRE</span>阅读练习时，充分运用平时所积累的知识，这样才能有效果。</p><p> <span word="It">It</span> <span word="is">is</span> <span word="well">well</span> <span word="known">known</span> <span word="that">that</span> <span word="biological">biological</span> <span word="changes">changes</span> <span word="at">at</span> <span word="the">the</span> <span word="molecular">molecular</span> <span word="level">level</span> <span word="have">have</span> <span word="morphogenetic">morphogenetic</span> <span word="consequences">consequences</span>, <span word="consequences">consequences</span> <span word="affecting">affecting</span> <span word="the">the</span> <span word="formation">formation</span> <span word="and">and</span> <span word="differentiation">differentiation</span> <span word="of">of</span> <span word="tissues">tissues</span> <span word="and">and</span> <span word="organs">organs</span>. <span word="It">It</span> <span word="is">is</span> <span word="superfluous">superfluous</span> <span word="to">to</span> <span word="point">point</span> <span word="out">out</span> <span word="that">that</span> <span word="gene">gene</span> <span word="mutations">mutations</span> <span word="and">and</span> <span word="disturbances">disturbances</span> <span word="of">of</span> <span word="the">the</span> <span word="bio">bio</span>-<span word="synthetic">synthetic</span> <span word="processes">processes</span> <span word="in">in</span> <span word="the">the</span> <span word="embryo">embryo</span> <span word="may">may</span> <span word="result">result</span> <span word="in">in</span> <span word="abnormalities">abnormalities</span> <span word="in">in</span> <span word="the">the</span> <span word="morphology">morphology</span> <span word="of">of</span> <span word="an">an</span> <span word="organism">organism</span>. <span word="However">However</span>, <span word="whereas">whereas</span> <span word="much">much</span> <span word="is">is</span> <span word="known">known</span> <span word="about">about</span> <span word="causes">causes</span> <span word="and">and</span> <span word="consequences">consequences</span> <span word="at">at</span> <span word="the">the</span> <span word="molecular">molecular</span> <span word="level">level</span>, <span word="and">and</span> <span word="in">in</span> <span word="spite">spite</span> <span word="of">of</span> <span word="an">an</span> <span word="enormous">enormous</span> <span word="accumulation">accumulation</span> <span word="of">of</span> <span word="chemical">chemical</span> <span word="and">and</span> <span word="morphological">morphological</span> <span word="data">data</span> <span word="on">on</span> <span word="embryos">embryos</span> <span word="of">of</span> <span word="various">various</span> <span word="kinds">kinds</span>, <span word="our">our</span> <span word="understanding">understanding</span> <span word="of">of</span> <span word="how">how</span> <span word="genes">genes</span> <span word="control">control</span> <span word="morphogenesis">morphogenesis</span> <span word="is">is</span> <span word="still">still</span> <span word="far">far</span> <span word="from">from</span> <span word="complete">complete</span>. <span word="Perhaps">Perhaps</span> <span word="one">one</span> <span word="reason">reason</span> <span word="for">for</span> <span word="this">this</span> <span word="is">is</span> <span word="that">that</span> <span word="molecular">molecular</span> <span word="biologists">biologists</span> <span word="and">and</span> <span word="morphologists">morphologists</span> <span word="speak">speak</span> <span word="different">different</span> <span word="languages">languages</span>. <span word="Whereas">Whereas</span> <span word="the">the</span> <span word="former">former</span> <span word="speak">speak</span> <span word="about">about</span> <span word="messenger">messenger</span>-<span word="RNA">RNA</span> <span word="and">and</span> <span word="conformational">conformational</span> <span word="changes">changes</span> <span word="of">of</span> <span word="protein">protein</span> <span word="molecules">molecules</span>, <span word="the">the</span> <span word="latter">latter</span> <span word="speak">speak</span> <span word="of">of</span> <span word="ectoderms">ectoderms</span>, <span word="hypoblasts">hypoblasts</span>, <span word="and">and</span> <span word="neural">neural</span> <span word="crests">crests</span>.</p><p> <span word="One">One</span> <span word="solution">solution</span> <span word="to">to</span> <span word="this">this</span> <span word="predicament">predicament</span> <span word="is">is</span> <span word="to">to</span> <span word="try">try</span> <span word="to">to</span> <span word="find">find</span> <span word="some">some</span> <span word="phenomena">phenomena</span> <span word="relevant">relevant</span> <span word="to">to</span> <span word="morphogenesis">morphogenesis</span> <span word="which">which</span> <span word="both">both</span> <span word="the">the</span> <span word="molecular">molecular</span> <span word="biologist">biologist</span> <span word="and">and</span> <span word="the">the</span> <span word="morphologist">morphologist</span> <span word="can">can</span> <span word="understand">understand</span> <span word="and">and</span> <span word="discuss">discuss</span>. <span word="As">As</span> <span word="morphogenesis">morphogenesis</span> <span word="must">must</span> <span word="be">be</span> <span word="basically">basically</span> <span word="the">the</span> <span word="result">result</span> <span word="of">of</span> <span word="changes">changes</span> <span word="in">in</span> <span word="behavior">behavior</span> <span word="of">of</span> <span word="the">the</span> <span word="individual">individual</span> <span word="cells">cells</span>, <span word="it">it</span> <span word="seems">seems</span> <span word="logical">logical</span> <span word="to">to</span> <span word="ask">ask</span> <span word="morphologists">morphologists</span> <span word="to">to</span> <span word="describe">describe</span> <span word="the">the</span> <span word="morphogenetic">morphogenetic</span> <span word="events">events</span> <span word="observed">observed</span> <span word="in">in</span> <span word="terms">terms</span> <span word="of">of</span> <span word="changes">changes</span> <span word="in">in</span> <span word="cellular">cellular</span> <span word="contact">contact</span>, <span word="changes">changes</span> <span word="in">in</span> <span word="the">the</span> <span word="rate">rate</span> <span word="of">of</span> <span word="proliferation">proliferation</span> <span word="of">of</span> <span word="cells">cells</span>, <span word="or">or</span> <span word="similar">similar</span> <span word="phenomena">phenomena</span>. <span word="Once">Once</span> <span word="this">this</span> <span word="is">is</span> <span word="done">done</span>, <span word="it">it</span> <span word="may">may</span> <span word="be">be</span> <span word="appropriate">appropriate</span> <span word="to">to</span> <span word="ask">ask</span> <span word="questions">questions</span> <span word="about">about</span> <span word="the">the</span> <span word="molecular">molecular</span> <span word="background">background</span> <span word="for">for</span> <span word="these">these</span> <span word="changes">changes</span>. <span word="One">One</span> <span word="may">may</span>, <span word="for">for</span> <span word="instance">instance</span>, <span word="ask">ask</span> <span word="whether">whether</span> <span word="variations">variations</span> <span word="in">in</span> <span word="cell">cell</span> <span word="contact">contact</span> <span word="reflect">reflect</span> <span word="alterations">alterations</span> <span word="in">in</span> <span word="the">the</span> <span word="populations">populations</span> <span word="of">of</span> <span word="molecules">molecules</span> <span word="at">at</span> <span word="the">the</span> <span word="cell">cell</span> <span word="surface">surface</span>, <span word="or">or</span> <span word="one">one</span> <span word="may">may</span> <span word="inquire">inquire</span> <span word="about">about</span> <span word="the">the</span> <span word="molecular">molecular</span> <span word="basis">basis</span> <span word="for">for</span> <span word="the">the</span> <span word="increased">increased</span> <span word="cell">cell</span> <span word="mobility">mobility</span> <span word="involved">involved</span> <span word="in">in</span> <span word="cell">cell</span> <span word="dispersion">dispersion</span>.</p>
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