4. Which description is NOT correct?
(A) A nucleic acid consists of four kinds of bases linked to a sugar–phosphate
backbone.
(B) A pair of nucleic acid strands with complementary sequences can form a
double-helical structure.
(C) DNA is a structurally rigid molecule that only exist in a specific helical form.
(D) Double-stranded DNA can wrap around itself to form a supercoiled structure.
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