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DNA Replication02:40

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DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied.  After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
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DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the single origin of replication (ori) on the cell's circular chromosome. Replication then proceeds around the entire circle of the chromosome in each direction from the two replication forks, resulting in two DNA molecules.
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In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
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The Replica Set Method: A High-throughput Approach to Quantitatively Measure Caenorhabditis elegans Lifespan
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Saving Science Through Replication Studies.

John E Edlund1, Kelly Cuccolo2, Megan S Irgens3

  • 1Department of Psychology, Rochester Institute of Technology.

Perspectives on Psychological Science : a Journal of the Association for Psychological Science
|March 8, 2021
PubMed
Summary
This summary is machine-generated.

Scientific replication is crucial but faces challenges. This study examines research paradigms, discusses improvements for scientific inquiry, and proposes various replication approaches to advance science.

Keywords:
collaborationmetasciencereplicationscience

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Area of Science:

  • Scientific methodology
  • Research integrity
  • Psychological science

Background:

  • The scientific enterprise traditionally relies on replication.
  • Recent awareness of issues impacting research replicability.
  • Concerns regarding the validity of scientific findings.

Purpose of the Study:

  • To examine research paradigms facing replication scrutiny.
  • To identify lessons learned from replication studies.
  • To propose strategies for improving scientific inquiry and replication.

Main Methods:

  • Analysis of three research paradigms with replication scrutiny.
  • Discussion of generalizable lessons from replication efforts.
  • Exploration of diverse approaches to scientific replication.

Main Results:

  • Identified paradigms with real findings, attenuated effects, and ongoing debate.
  • Highlighted the value of replication in assessing research validity.
  • Outlined potential improvements for scientific research practices.

Conclusions:

  • Replication is essential for scientific progress and trust.
  • Adopting varied replication strategies can enhance scientific rigor.
  • Future scientific inquiry must prioritize robust replication methods.