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某纯化的RNA分子经T1核糖核酸酶彻底酶解，然后分离寡核苷酸产物。其中一个片段经碱水解产生1腺苷，1Up，和2Cp残基。同一片段用多核苷酸激酶和γ-32P-ATP处理，继而用蛇毒磷酸二酯酶彻底酶解，产生带放射性的pU和非放射性的pC和pA。
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根据以下内容，回答下列各题。 The large part which war played in English affairs in the Middle-Ages, the fact that the control of the army and navy was in the hands of those that spoke French, and the circumstances that much of English fighting was done in France all resulted in the introduction into English of a number of French military terms．The art of war has undergone such changes since the battles of Hastings, Lewes, and Agincourt that many words once common are now only in historical use．Their places have been taken by later borrowings, often like wise from French, many of them being words acquired by the French in the course of their wars in Italy during the sixteenth century．Yet we still use French words of the Middle Ages when we speak of the army and the navy, of peace, enemy, battle, soldier, guard and spy, and we have kept the names of officers such as captain and sergeant．Some of the French terms were introduced into English because they were needed to express a new object or a new idea．In other cases a French and a native English word for the same thing existed side by side．Sometimes one or the other has since been lost from the language; but sometimes both the borrowed and the native word have been still in common use． The main idea of this passage is that ______．
人类腺病毒引起上呼吸道感染。该病毒具分子量为20×106U的双链DNA。当DNA的轻、重两链分离并在电镜下观察时，其结构如图2-3-44所示。若此单链DNA用核酸外切酶Ⅲ预处理，那么这些环状结构就会消失。问腺病毒DNA具何种结构？
企业集团的各成员组成不包括（）。
DNA分子易被水溶液中的机械剪切力切断。这些力作用于DNA分子使之在近中点处切断。随着这种力的慢慢增加，DNA分
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