During PCR, what happens to the two strands of DNA during the denaturation step?

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Multiple Choice

During PCR, what happens to the two strands of DNA during the denaturation step?

Explanation:
During the denaturation step, the high heat breaks the hydrogen bonds between the two strands, causing the double-stranded DNA to separate into two single strands. This separation creates templates for primers to bind in the following step. Recombination would involve exchanging DNA segments, which isn’t what the heat does here. The strands don’t become double-stranded during denaturation (they do so again after annealing), and methylation isn’t affected by this step.

During the denaturation step, the high heat breaks the hydrogen bonds between the two strands, causing the double-stranded DNA to separate into two single strands. This separation creates templates for primers to bind in the following step. Recombination would involve exchanging DNA segments, which isn’t what the heat does here. The strands don’t become double-stranded during denaturation (they do so again after annealing), and methylation isn’t affected by this step.

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