The genome of D. melanogaster consists of approximately 1.7x10⁸ base pairs. DNA synthesis occurs at a rate of 30 base pairs per second. In the early embryo, the entire genome is replicated in five minutes. How many bidirectional origins of synthesis are required to accomplish this feat?

Video transcript

Everyone. Let's take a look at this question together. Which of the following is different in bacterial and eukaryotic DNA replication. Let's recall the process of DNA replication in bacterial cells and eukaryotic cells. To compare them to figure out which of the following is different. So we know that in answer to a in the origin of replication when we're talking about the origin of replication in bacterial cells, the bacteria as one origin. However in those eukaryotic cells they actually have multiple origin sites and this is actually per chromosome. So bacteria have one origin per chromosome and you paradox cells have multiple origins per chromosome. So we could say that the origin of replication in bacterial cells and in eukaryotic DNA is different. So answer choice A. Is the correct answer. And we also note that answer choice A. Is correct because answer choices B. C. And D. Are all the same same for both bacteria and eukaryotic cells. Because the unwinding of the DNA double helix stabilization of unwound individual DNA strands and the synthesis of RNA primers is the same for both bacteria and eukaryotic cells. So answer choice A origin of replication is the only one here that is different between the two. I hope you found this video to be helpful. Thank you and goodbye