About This Chapter
DNA Replication - Chapter Summary and Course Objectives
The information that determines your genetic identity is preserved at the cellular level, and the chemical nature of the gene makes this possible, as you will learn in this chapter. These lessons cover DNA replication. Through our lessons, you will learn the patterns and attributes that make this double helix the ultimate coding and proofreading machine. You'll also study replication forks, parental strands and daughter strands, as well as leading and lagging strands. If these terms seem like complete strangers now, you'll soon view them as old friends. By the end of these lessons, you'll understand:
- How primase aids DNA polymerase
- What Okazaki fragments are
- What happens before DNA replication begins
- Models of DNA replication
- The roles of different enzymes in the replication process
|What is DNA Replication? - Conservative, Semi-Conservative & Dispersive Models||Study the different types of DNA replication models.|
|How Helicase Unwinds the DNA Double Helix in Preparation for Replication||Explore the origin of replication.|
|How DNA Polymerase and RNA Primase Initiate DNA Replication||Examine the roles of RNA primase, RNA primase and DNA polymerase|
|Replication of the Leading and Lagging Strands of DNA||Discover how leading strand, lagging strand, Okazaki fragment and DNA ligase are related to DNA replication.|
|DNA Replication: Review of Enzymes, Replication Bubbles & Leading and Lagging Strands||Review DNA replication in-depth with a look at detailed concepts and enzymes.|
1. What Is DNA Replication? - Conservative, Semi-Conservative & Dispersive Models
How do we know that DNA replication is semi-conservative? How do we know it's not conservative or dispersive? Let's follow the famous experiment by Meselson and Stahl to find out!
2. How Helicase Unwinds the DNA Double Helix in Preparation for Replication
How does semi-conservative replication begin? Discover how DNA helicase creates a replication fork to unwind the complicated DNA molecule and allow daughter strands to form on the parental template.
3. How DNA Polymerase and RNA Primase Initiate DNA Replication
How do enzymes assist in starting DNA replication? In this lesson, we explore the work of a contributing enzyme, DNA polymerase, and learn how the RNA primer is made by the action of RNA primase.
4. DNA Replication: The Leading Strand and DNA Polymerase Activities
How does replication occur in the antiparallel DNA molecule? In this lesson, explore the significance of the leading and lagging strands, and learn how Okazaki fragments and RNA ligase make DNA replication possible.
5. DNA Replication: Review of Enzymes, Replication Bubbles & Leading and Lagging Strands
Feeling lost in the thorny details of DNA replication? This lesson provides an overview of semi-conservative replication, with a focus on putting together all of the concepts involved. We'll review the work of each enzyme on our way to completing the big picture of DNA replication.
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Other chapters within the Biology 101: Intro to Biology course
- Basic Terms & Skills in Biological Science
- Inorganic Chemistry Review for Biology
- Introduction to Organic Molecules & Heterotrophs
- The Nucleotide Structure of DNA & RNA
- Enzyme Function, Interactions & Regulation
- Cell Membrane Model, Components & Transport
- Cell Structure, Organelles & Organelle Functions
- Transcription, Translation & Protein Synthesis
- Types & Effects of Genetic Mutations
- Cellular Metabolism & Respiration
- Cell Growth & The Process of Cell Division
- The Musculoskeletal, Circulatory, Respiratory, Digestive & Excretory Systems
- The Nervous System & Endocrine System
- Reproduction, Development & Survival in Animals
- Mendelian Genetics & Mechanisms of Heredity
- Ecology Principles & Community Ecology
- Evolutionary Principles & Natural Selection
- Earth's Timeline & Geological Evolution
- Taxonomic Classification & Phylogeny
- Genetic Engineering & DNA Sequencing
- Studying for Biology 101