GRE阅读难句背诵实例（九）
<p> 编辑点评： <span word="GRE">GRE</span>阅读的复习和作文的复习往往可以相辅相成，这里为大家精选了一些阅读中的句子，大家可以选择性地用在作文中作为一个例证。也可以参考句子的结构自己学着写一下结构较为复杂的句子。</p><p> 40.<span word="It">It</span> <span word="is">is</span> <span word="possible">possible</span> <span word="to">to</span> <span word="make">make</span> <span word="specific">specific</span> <span word="complementary">complementary</span> <span word="DNA">DNA</span> <span word="sthat">sthat</span> <span word="can">can</span> <span word="serve">serve</span> <span word="as">as</span> <span word="molecular">molecular</span> <span word="probes">probes</span> <span word="to">to</span> <span word="seek">seek</span> <span word="out">out</span> <span word="the">the</span> <span word="messengerRNA">messengerRNA</span> <span word="s">s</span> <span word="of">of</span> <span word="the">the</span> <span word="peptide">peptide</span> <span word="hormones">hormones</span>. <span word="If">If</span> <span word="brain">brain</span> <span word="cells">cells</span> <span word="are">are</span> <span word="making">making</span> <span word="thehormones">thehormones</span>，<span word="the">the</span> <span word="cells">cells</span> <span word="will">will</span> <span word="contain">contain</span> <span word="these">these</span> <span word="Mrna">Mrna</span> <span word="S">S</span>. <span word="If">If</span> <span word="the">the</span> <span word="products">products</span> <span word="the">the</span> <span word="braincells">braincells</span> <span word="make">make</span> <span word="resemble">resemble</span> <span word="the">the</span> <span word="hormones">hormones</span> <span word="but">but</span> <span word="are">are</span> <span word="not">not</span> <span word="identical">identical</span> <span word="to">to</span> <span word="them">them</span>，<span word="then">then</span> <span word="thecDNA">thecDNA</span> <span word="s">s</span> <span word="should">should</span> <span word="still">still</span> <span word="bind">bind</span> <span word="to">to</span> <span word="these">these</span> <span word="mRNA">mRNA</span> <span word="s">s</span>，<span word="but">but</span> <span word="should">should</span> <span word="not">not</span> <span word="bind">bind</span> <span word="astightly">astightly</span> <span word="as">as</span> <span word="they">they</span> <span word="would">would</span> <span word="to">to</span> <span word="mRNA">mRNA</span> <span word="s">s</span> <span word="for">for</span> <span word="the">the</span> <span word="true">true</span> <span word="hormones">hormones</span>.</p><p> 科学家可以制造出特异的互补<span word="DNA">DNA</span> <span word="s">s</span>，以此作为分子探子，探觅出肽激素的信使<span word="RNA">RNA</span> <span word="s">s</span>。如果大脑正在制造着肽激素，则细胞就会含有这些信使<span word="RNA">RNA</span> <span word="s">s</span>.假若细胞所制造的产品类似于肽激素但并非与这些肽激素全然相同，那么，互补<span word="cDNA">cDNA</span> <span word="s">s</span>应仍然和这些信使<span word="mDNA">mDNA</span> <span word="s">s</span>粘结的程度。含有这些<span word="mRNA">mRNA</span> <span word="s">s</span>的脑细胞然后就可以被分离开来，研究者可对其信使<span word="RNA">RNA</span> <span word="s">s</span>进行解码，以确定它们的蛋白质产品究竟是什么，并确定这些蛋白质产品在何种程度上类似于真正的肽激素。</p><p> 41.<span word="The">The</span> <span word="molecular">molecular</span> <span word="approach">approach</span> <span word="to">to</span> <span word="detecting">detecting</span> <span word="peptide">peptide</span> <span word="hormones">hormones</span> <span word="using">using</span> <span word="cDNAprobes">cDNAprobes</span> <span word="should">should</span> <span word="also">also</span> <span word="be">be</span> <span word="much">much</span> <span word="faster">faster</span> <span word="than">than</span> <span word="the">the</span> <span word="immunological">immunological</span> <span word="method">method</span> <span word="becauseit">becauseit</span> <span word="can">can</span> <span word="take">take</span> <span word="years">years</span> <span word="of">of</span> <span word="tedious">tedious</span> <span word="purifications">purifications</span> <span word="to">to</span> <span word="isolate">isolate</span> <span word="peptide">peptide</span> <span word="hormonesand">hormonesand</span> <span word="then">then</span> <span word="develop">develop</span> <span word="antiserums">antiserums</span> <span word="to">to</span> <span word="them">them</span>.</p>
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