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【单选题】
下列关于DNA和RNA聚合酶的论述哪一种是正确的:A.
RNA聚合酶用核苷二磷酸而不是核苷三磷酸来合成多核苷酸链
B.
RNA聚合酶需要引物，并在生长的多核苷酸链的5’端加上核苷酸
C.
DNA聚合酶需要引物，并在生长的多核苷酸链的5’端加上核苷酸
D.
DNA聚合酶能在核苷酸链的两端加上核苷酸
E.
所有RNA和DNA聚合酶只能在多核苷酸链的3’端加上核苷酸
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