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Each replication bubble consists of

  • A.3 replication forks
  • B.2 replication forks
  • C.4 replication forks
  • D.1 replication fork

Answer: B

Correct answer: 2 replication forks

A bubble opens at an origin and grows bidirectionally, so it has a fork at each end - two in all - moving in opposite directions. Copying from a single origin in both directions halves the time the chromosome takes to replicate.

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