About This Chapter
GRE Biology: DNA Replication - Chapter Summary
Review the fundamentals of DNA replication by watching these brief and engaging video lessons taught by our expert instructors. DNA replication topics covered in our lessons include:
- Conservative, semi-conservative and dispersive models of DNA replication
- How the helicase enzyme unwinds the DNA double helix
- Initiation of DNA replication by DNA polymerase and RNA primase enzymes
- Activities of the leading strand and DNA polymerase enzyme
- Enzymes, replication bubbles and leading and lagging strands
You can watch each video as many times as necessary to be sure you have the materials down pat. Transcripts of the lessons provide an alternative learning resource to support what you watched and heard in the videos. When you are ready, take a chapter exam to help you determine your preparedness for DNA replication questions on the GRE Biology test.
GRE Biology Objectives
The GRE Biology test is a subject matter test offered to graduate school applicants to demonstrate the breadth of their knowledge of biology. The test is composed of 190 multiple-choice questions organized into three main subject areas: cellular and molecular biology, organismal biology, and ecology and evolution. Questions regarding DNA replication are grouped under the genetics and molecular biology topics of the cellular and molecular biology subject area. Genetics and molecular biology topics comprise 16% to 17% of all test questions.
Our lessons cover what you need to know about DNA replication for the GRE Biology test, which is offered three times per year in September, October and April in a paper format.
1. What Is DNA Replication? - Conservative, Semi-Conservative & Dispersive Models
DNA replication, the process of copying DNA, has three different models to explain its processes, the most well-known of which is the Meselson and Stahl model. Learn about their experiments, as well as how those experiments disproved older models.
2. How Helicase Unwinds the DNA Double Helix in Preparation for Replication
DNA helicase is a vital enzyme that unwinds the DNA double helix and prepares DNA for replication. Learn about this process by exploring the semi-conservative model of DNA replication, explore how DNA helicase unwinds the DNA double helix, and discover the origin of replication and replication fork.
3. How DNA Polymerase and RNA Primase Initiate DNA Replication
DNA replication involves the process of splitting DNA molecules down the middle. Different enzymes, such as DNA polymerase and RNA primase, have different roles in this process, including building daughter strands of DNA and priming for replication. Learn about how DNA replication is started and the enzymes that help it occur.
4. DNA Replication: The Leading Strand and DNA Polymerase Activities
The beginning of DNA replication requires the splitting of two parent DNA strands. DNA polymerase makes short lengths of DNA that are then bound together by DNA ligase. Learn how these enzymes work together to aid in DNA replication.
5. DNA Replication: Review of Enzymes, Replication Bubbles & Leading and Lagging Strands
Enzymes, parent strands, and daughter strands are parts of the process of DNA replication. Learn about the parts of DNA replication, including enzymes, replication bubbles, and leading and lagging strands.
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