29. Which of the following best describes siRNA?
(A) a short double-stranded RNA, one of whose strands can complement and inactivate a sequence of
mRNA
(B) a single-stranded RNA that can, where it has internal complementary base pairs, fold into cloverleaf
patterns
(C) a double-stranded RNA that is formed by cleavage of hairpin loops in a larger precursor
(D) a molecule, known as Dicer, that can degrade other mRNA sequences
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