45. Attenuation(Premature termination)與 His operons 之表現調控有關，下列何者不涉及此過 程？
(A)Operator
(B)Leader peptide
(C)mRNA 所形成之二級結構(Secondary structure)
(D)核醣體(Ribosome)

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統計： A(4), B(0), C(4), D(0), E(0) #898650