When DNA is heated to just below boiling (90°C-95°C),
A. the helix unwinds but hydrogen bonds between the bases remain intact.
B. the sugar, phosphate, and base come apart in each nucleotide.
C. the two DNA strands separate completely.
D. nothing happens until the boiling point is reached (100°C).
E. the sugar phosphate backbone of the DNA strands breaks.
Answer: C
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