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【单选题】
真核生物mRNA的3′-末端'尾巴'结构是( )A.
约200个核苷酸的poly(C)
B.
约200个核苷酸的poly(A)
C.
约100个核苷酸的poly(G)
D.
约200个核苷酸的poly(U)
E.
约300个核苷酸的poly(U)
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A.
-______
B.
No
C.
Nothing
D.
None
E.
Nobody
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