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RNA上的intron是指
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真核生物中tRNA和5SrRNA的转录由下列哪一种酶催化
The following paragraphs are taken from the text, followed by a list of words or expressions. Choose the one that best completes each of the sentences."We must draw lots," the mayor said 1 . "It is the only fair thing." He sat with his hands still 2 his stomach, 3 his watch, but all through the cell you could hear its 4 tick tock tick. He added, " 5 the unmarried. The married should not be 6 . They have 7 ..." Chavel was 8 with a huge and shameful joy. It seemed to him that al- ready he was 9 —twenty-nine men to draw and only two marked papers 10 The chances had suddenly grown in his 11 from ten to one 12 —fourteen to one: the greengrocer had drawn a slip and 13 carelessly and without pleasure that he was 14 They watched him 15 astonishment but without 16 . He was a 17 . They didn’t judge him 18 their 19 standards, he belonged to an 20 class and they didn’t at first even attach the idea of 21 to his actions. A. pressed over B. enmity C. cowardice D. blunt E. filled F. to G. by H. hiding I. left J. favor K. firmly L. On M. with N. own O. included P. gentleman Q. unaccountable R. responsibilities S. indicated T. safe U. saved
5"-ATCGTACGGCTA-3"为一结构基因的有意义链，其转录产物为
下列关于DNA转录的叙述正确的是
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