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Chapter 11: Problem 3

Unlike prokaryotes, why do eukaryotes need multiple replication origins?

Short Answer

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Short Answer: Eukaryotes require multiple replication origins due to the larger size and complex structure of their genomes. This allows DNA replication to occur more quickly and efficiently, ensuring the entire genome is duplicated in a reasonable amount of time during the cell cycle. In contrast, prokaryotes typically have a single origin of replication as their smaller, circular DNA can be replicated more easily.

Step by step solution

01

Define prokaryotes and eukaryotes

Prokaryotes are single-celled organisms like bacteria and archaea, while eukaryotes are more complex organisms such as plants, animals, and fungi. One key difference between these two types of cells is the organization and structure of their DNA.
02

Describe the structure and size of DNA in prokaryotes and eukaryotes

Prokaryotic DNA is usually organized in a single, circular molecule, and is generally smaller in size when compared to eukaryotic DNA. Eukaryotic DNA, on the other hand, is organized into large, linear chromosomes that are located inside the nucleus of the cell. Eukaryotic organisms typically have a larger genome, containing much more DNA than prokaryotic organisms.
03

Explain the process of DNA replication

DNA replication is the process by which a cell duplicates its DNA before dividing, ensuring that each daughter cell receives an exact copy of the genetic material. DNA replication begins at specific sites on the DNA molecule called origins of replication. In prokaryotes, there is typically only one origin of replication per DNA molecule. In eukaryotes, however, there are multiple origins of replication spread across the chromosomes.
04

Explain the need for multiple replication origins in eukaryotes

Due to the large size of the eukaryotic genome, having just one origin of replication would result in a very slow replication process, as the replication machinery would need to travel the length of the entire chromosome to duplicate the DNA. Multiple replication origins in eukaryotes allow for the process to take place quicker and more efficiently, with multiple sections of the DNA being replicated simultaneously. This ensures that the entire genome can be duplicated in a reasonable amount of time during the cell cycle.
05

Conclude the explanation

Eukaryotes need multiple replication origins due to the larger size and complex structure of their genomes. Multiple origins of replication ensure that the DNA can be replicated efficiently and quickly, which is crucial for the cell division process. This is a key difference between prokaryotes and eukaryotes, and reflects the overall complexity and vast differences in organization between these two types of organisms.

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Most popular questions from this chapter

In this chapter, we focused on how DNA is replicated and synthesized. We also discussed recombination at the DNA level and the phenomenon of gene conversion. Along the way, we encountered many opportunities to consider how this information was acquired. On the basis of these discussions, what answers would you propose to the following fundamental questions? (a) What is the experimental basis for concluding that DNA replicates semiconservatively in both prokaryotes and eukaryotes? (b) How was it demonstrated that DNA synthesis occurs under the direction of DNA polymerase III and not polymerase I? (c) How do we know that in vivo DNA synthesis occurs in the \(5^{\prime}\) to \(3^{\prime}\) direction? (d) How do we know that DNA synthesis is discontinuous on one of the two template strands? (e) What observations reveal that a "telomere problem" exists during eukaryotic DNA replication, and how did we learn of the solution to this problem?

Summarize and compare the properties of DNA polymerase I II, and III.

In Kornberg's initial experiments, it was rumored that he grew E. coli in Anheuser-Busch beer vats. (Kornberg was working at Washington University in St. Louis.) Why do you think this might have been helpful to the experiment?

Prokaryotic Okazaki fragments are in the range of 1200 nucleotides, while eukaryotic fragments are much shorter, more in the range of \(100-150\) nucleotides. Balakrishnan and Bambara (2013) suggest that the shorter length of Okazaki fragments is determined by nucleosome periodicity. Design an experiment to determine whether or not the length of Okazaki fragments in eukaryotes is dependent on nucleosomes being present on \(\mathrm{J}\)

Reiji and Tuneko Okazaki conducted a now classic experiment in 1968 in which they discovered a population of short fragments synthesized during DNA replication. They introduced a short pulse of \(^{3} \mathrm{H}\) -thymidine into a culture of \(E .\) coli and extracted DNA from the cells at various intervals. In analyzing the DNA after centrifugation in denaturing gradients, they noticed that as the interval between the time of \(^{3} \mathrm{H}\) -thymidine introduction and the time of centrifugation increased, the proportion of short strands decreased and more labeled DNA was found in larger strands. What would account for this observation?
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