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【单选题】
When does capping of the pre-mRNA occur?A.
It is the first nucleotide added by RNA polymerase.
B.
It occurs before the mRNA reaches a chain length of 30 nt.
C.
It occurs after the poly(A) tail has been added.
D.
It occurs after splicing has occurred.
E.
It occurs after export of the mRNA into the cytoplasm.
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【单选题】When does capping of the pre-mRNA occur?
A.
It is the first nucleotide added by RNA polymerase.
B.
It occurs before the mRNA reaches a chain length of 30 nt.
C.
It occurs after the poly(A) tail has been added.
D.
It occurs after splicing has occurred.
E.
It occurs after export of the mRNA into the cytoplasm.
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