Ch 17: Praxis Biology & General Science: DNA and Replication

About This Chapter

Our video lessons can teach you about nucleic acids and DNA's functions. Get details on the differences between DNA and RNA, and find out what DNA replication is to help you prepare for the Praxis II Biology and General Science exam.

Praxis Biology & General Science: DNA and Replication - Chapter Summary

Utilize the lessons in this chapter to refresh your understanding of what DNA is and how DNA replication works as you prepare for the Praxis II Biology and General Science test. Professional instructors provide concise lessons covering the following areas:

  • Two categories of nucleic acids
  • Definition and function of DNA
  • Four bases found in DNA
  • Complementary base pairing
  • DNA structure
  • Types of RNA
  • Three models for DNA replication
  • Semi-conservative replication process
  • Components of DNA replication

Throughout each of the video lessons, you'll get in-depth descriptions and examples of the concepts and processes associated with DNA and replication. Each lesson has a summary to provide you with an overview of the important topics discussed in the lesson. You'll also find links to more detailed descriptions of key terms in case you need additional help understanding those concepts. Self-assessment quizzes accompany each lesson and are similar in format to the questions you'll see on the Praxis II test.

Praxis Biology & General Science: DNA and Replication Objectives

The Praxis II Biology and General Science test assesses teacher candidates' abilities to teach these topics in the classroom. The test consists entirely of multiple-choice questions and has eight content areas that you'll need to prepare for, including a content area on molecular and cellular biology. Questions in this content area will ask you about DNA and replication. The molecular and cellular biology content area has 18 questions, representing about 15% of the entire test.

9 Lessons in Chapter 17: Praxis Biology & General Science: DNA and Replication
Test your knowledge with a 30-question chapter practice test
DNA: Chemical Structure of Nucleic Acids & Phosphodiester Bonds

1. DNA: Chemical Structure of Nucleic Acids & Phosphodiester Bonds

In this lesson, you'll discover what nucleotides look like and how they come together to form polynucleotides. We'll also explore nucleic acids and focus on DNA in particular.

DNA: Adenine, Guanine, Cytosine, Thymine & Complementary Base Pairing

2. DNA: Adenine, Guanine, Cytosine, Thymine & Complementary Base Pairing

Learn the language of nucleotides as we look at the nitrogenous bases adenine, guanine, cytosine and thymine. Armed with this knowledge, you'll also see why DNA strands must run in opposite directions.

DNA: Discovery, Facts, Structure & Function in Heredity

3. DNA: Discovery, Facts, Structure & Function in Heredity

This lesson will help you to navigate the twists and turns of DNA's structure. We'll also clue you in on the amazing discoveries that put this nucleic acid in the limelight as the molecule of heredity.

Differences Between RNA and DNA & Types of RNA (mRNA, tRNA & rRNA)

4. Differences Between RNA and DNA & Types of RNA (mRNA, tRNA & rRNA)

In this lesson, you'll explore RNA structure and learn the central dogma of molecular biology. Along the way, you'll meet the three types of RNA and see how the cell uses them most effectively.

What Is DNA Replication? - Conservative, Semi-Conservative & Dispersive Models

5. 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!

How Helicase Unwinds the DNA Double Helix in Preparation for Replication

6. 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.

How DNA Polymerase and RNA Primase Initiate DNA Replication

7. 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.

DNA Replication: The Leading Strand and DNA Polymerase Activities

8. 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.

DNA Replication: Review of Enzymes, Replication Bubbles & Leading and Lagging Strands

9. 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.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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