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प्रश्न
When DNA replication begins ______.
पर्याय
the two DNA strands unwind from each other
old strands move to find new strands
two DNA molecules bond
the two DNA strands condense for base transfers
MCQ
रिकाम्या जागा भरा
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उत्तर
When DNA replication begins, the two DNA strands unwind from each other.
Explanation:
DNA replication begins at origins where the double helix untwists, and the hydrogen bonds between base pairs are broken, producing two single-stranded templates; those exposed strands are then used to synthesise complementary new strands (semi‑conservative replication).
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