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Helicases and gyrases both function to uncoil the supercoiling of the two DNA strands. Moreover, gyrase is responsible for adjusting the tension in the two strands so that they don't snap while unraveling.

Q: What enzyme is responsible for breaking the hydrogen bonds between the two strands and unwinding the helix?
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Helicases and gyrases both function to uncoil the supercoiling of the two DNA strands. Moreover, gyrase is responsible for adjusting the tension in the two strands so that they don't snap while unraveling.

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The topoisomerase enzyme uncoils the double helical structure of DNA during its replication to form the replication fork. In eukaryotes both posive and negative supercoils get unbind by topoisomerase I & II respectively.

Topoisomerase isomerase unwinds DNA to form replication fork

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Helicase unwind the two DNA strands while topoisomerase unwind and also rejoin the the two strands of DNA.

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Topoisomerase

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Topoisomerase 1

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