Biology / Unit 6 Bio 1215 short lesson, about 20 seconds
Origins of Replication
Captions available
The idea
An origin of replication is a specific DNA sequence where the replication machinery assembles and unwinding begins, opening a replication bubble.
In practice
E. coli's single circular chromosome carries one AT-rich origin of replication, roughly 245 base pairs long.
Where people slip
An origin marks where replication starts, not where it ends — the replication forks it opens travel outward in both directions.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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