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【单选题】
关于原核生物的 RNA 合成,下列说法错误的是( )A.
合成的 RNA 链与模板链是反向平行的
B.
RNA 链合成的准确起始需要 ρ 因子
C.
RNA 链合成时，第一个核苷酸常为嘌呤核苷酸
D.
RNA 链合成时， DNA 结构暂时发生变化
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【单选题】Although of course there are exceptions, it seems reasonably clear that in certain countries—Rwanda, Somalia and parts of the former Yugoslavia come to mind—hunger is less a result of an absolute food...
A.
than of
B.
rather than
C.
but the result of
D.
than is
【单选题】Although of course there are exceptions, it seems reasonably clear that in certain countries—Rwanda, Somalia and parts of the former Yugoslavia come to mind—hunger is less a result of an absolute food...
A.
than of
B.
rather than
C.
but the result of
D.
than is
【单选题】As ________ clear from his manners, he seems to be much of a scholar.
A.
being
B.
is
C.
if
D.
though
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