The replication fork is a .......

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(B) During $DNA$ replication,the enzyme $DNA$ helicase breaks the hydrogen bonds between the nitrogenous bases of the two $DNA$ strands.This action re

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small opening of the $DNA$ helix.

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(B) During $DNA$ replication,the enzyme $DNA$ helicase breaks the hydrogen bonds between the nitrogenous bases of the two $DNA$ strands.This action results in the unwinding of the double helix,creating a $Y$-shaped structure known as the replication fork.This structure represents a small opening of the $DNA$ helix where new strands are synthesized by $DNA$ polymerase.Therefore,the replication fork is a small opening of the $DNA$ helix.

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