28. The excision (splicing) of many group I introns requires, in addition to the primary transcript RNA:
(A) a cytosine nucleoside or nucleotide and a protein enzyme.
(B) a guanine nucleoside or nucleotide (only).
(C) a protein enzyme only.
(D) a small nuclear RNA and a protein enzyme.
(E) ATP, NAD, and a protein enzyme.

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