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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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deanaraye deanaraye
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9 years ago
DNA replication in a newly discovered eukaryotic organism occurs about every 8 minutes. Its genome contains approximately 2.4 X 108 base pairs. Eukaryotic DNA polymerases synthesize DNA at a rate of approximately 40 nucleotides per second. Approximately how many origins of replication are required for this rate or replication?
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9 years ago
At each origin of replication, DNA is replicated on both directions. That means, for each origin of replication there are 2 DNA polymerases.
Because of that, the replication rate that corresponds for each origin of rep. is 2*40=80 noucl/sec.

We assume that the total time of replication is 8 minutes= 8*60=480 seconds (although we are not told exactly how long the replication lasts).

So, if we assume that the replication stage lasts 8 minutes, then we need 480/80=6 origins of replication.
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