A) it changes into RNA
B) it breaks into two fragments
C) it breaks into many fragments
D) it uncoils and the two strands separate
Correct Answer: D
Solution :
Heating of DNA strands at temperatures\[80-{{90}^{o}}C\]results to breakage of hydrogen bonds between nitrogen bases of two strands (denaturation). The strands show reunion on cooling (renaturation/annealing).
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