Specific sites where replication begins, singular in bacteria and multiple in eukaryotic chromosomes.
In E. coli, oriC is bound by DnaA to open the DNA; replication is bidirectional. Human cells use around 30,000 to 50,000 origins licensed in G1 by ORC, Cdc6 and MCM helicase and fired once in S phase.
Licensing prevents re-replication.
Specific sites where replication begins, singular in bacteria and multiple in eukaryotic chromosomes.
Origin of Replication is one of the 52 topics in Molecular Biology. It is rated Advanced, so it suits learners who want specialist depth. Related topics in this area include DNA Replication, Transcription Factors, Mediator Complex.
Yeast autonomously replicating sequences (ARS) were found as plasmid origins.
Work through the Beginner topics in Molecular Biology first, such as Central Dogma, DNA Replication, Base Pairing, then return to Origin of Replication. Advanced topics assume the Intermediate vocabulary.
The closest topics to Origin of Replication are DNA Replication, Transcription Factors, Mediator Complex, Enhancers and Silencers. Comparing them side by side is a good way to see how the ideas connect.
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Origin of Replication. To practise the whole of Molecular Biology, use the Molecular Biology quiz.
Origin of Replication: Specific sites where replication begins, singular in bacteria and multiple in eukaryotic chromosomes. DNA Replication: The copying of DNA before cell division so each daughter cell receives a full set of genes. Read both side by side and note what each one explains.
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with DNA Replication and explain the difference aloud. Finally, take the Molecular Biology quiz and come back to this page for any question you miss.
The copying of DNA before cell division so each daughter cell receives a full set of genes.
🧫 Molecular BiologyProteins that bind specific DNA sequences to turn genes on or off.
🧫 Molecular BiologyA large multi-protein assembly that links enhancer-bound transcription factors to RNA polymerase II.
🧫 Molecular BiologyDistant regulatory DNA elements that increase or decrease transcription via looping to the promoter.
🧫 Molecular Biology