Discussion
Termination of replication is triggered by
Answer: D
Correct answer: Tus protein
Replication in E. coli ends at the ter sites, where the Tus protein binds and acts as a one-way barrier: it blocks the approaching replication fork by arresting the DnaB helicase, but only from one direction. The two forks travelling round the circular chromosome are therefore trapped in the terminus region and meet there.
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