alleryDuring DNA replication, the enzyme that unwinds the double helix is
ADNA polymerase III
Bligase
Chelicase
Dprimase
Answer & Solution
Correct answer: C. helicase
1. Helicase breaks the hydrogen bonds between complementary bases at the replication fork.
2. This separates the two strands and exposes them as templates.
3. DNA polymerase, primase and ligase act on the already-unwound single strands.
_Source: Maharashtra Balbharati Std XII Biology, Ch 4 "Molecular Basis of Inheritance" §4.5_
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