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Ch 8: DNA, RNA & Gene Expression

About This Chapter

If you need to study DNA, RNA and gene expression topics for a upcoming exam or biology assignment, you're in the right place! This chapter contains short video lessons and practice quizzes that can help you quickly refresh your knowledge of these biological concepts.

DNA, RNA & Gene Expression - Chapter Summary

For an overview of basic DNA, RNA and gene expression topics, work through this comprehensive study guide chapter. Inside the chapter, you'll find a series of short biology lessons that cover the fundamentals of base pairs, RNA types, DNA replication, transcription and much more. By the end of the chapter, you should be able to:

  • Define DNA and gene expression
  • Compare types of base pairs
  • Differentiate between DNA and RNA
  • Explain the functions of mRNA, tRNA and rRNA
  • Summarize the process of DNA replication
  • Assess the purpose of DNA replication forks
  • Evaluate the regulation of gene expression through transcriptional induction and repression
  • Understand how transcription in prokaryotic cells are controlled by operons

When you finish a lesson, you'll be pointed to a short quiz that reinforces essential terms and concepts. Take the lesson quizzes to master the information while it's still fresh in your mind. The chapter concludes with a comprehensive exam, and if you need any help along the way, feel free to submit your questions to our subject-matter experts. The chapter is available 24/7, and you can access it online using any Internet-connected device.

9 Lessons in Chapter 8: DNA, RNA & Gene Expression
Test your knowledge with a 30-question chapter practice test
What is DNA?

1. What is DNA?

In this lesson, we will learn what DNA is, what its characteristics and functions are, even where it is located and what information it contains. We'll also learn how the double helix is created. Find out more.

Base Pairs: Definition & Types

2. Base Pairs: Definition & Types

Nitrogenous bases pair with each other using hydrogen bonds. Learn how base pairs keep DNA together and how they help RNA take on useful shapes. Afterwards, you can test your knowledge with a quiz.

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

3. 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.

tRNA: Role, Function & Synthesis

4. tRNA: Role, Function & Synthesis

This lesson focuses on transfer RNA (tRNA). It covers what tRNA is, what it does in our cells, and how it is made. It also gives a brief description of the history and discovery of tRNA.

How Does DNA Replicate?

5. How Does DNA Replicate?

In this lesson, we will learn why DNA replicates as well as how. We'll also learn about the rates of replication and how DNA proofreads itself. After watching the lesson, you can complete a short quiz to test your knowledge.

DNA Replication Fork: Definition & Overview

6. DNA Replication Fork: Definition & Overview

DNA defines an individual and is shaped like a spiral staircase. But how is DNA replicated if it is so twisted? Learn what a DNA replication fork is and its importance in this lesson.

What Is Gene Expression? - Regulation, Analysis & Definition

7. What Is Gene Expression? - Regulation, Analysis & Definition

What is a gene? How are genes expressed? What does the term gene expression mean? Can we analyze gene expression? These questions will be addressed in this lesson.

Regulation of Gene Expression: Transcriptional Repression and Induction

8. Regulation of Gene Expression: Transcriptional Repression and Induction

Do our genes work the same way all the time? How do we regulate the expression of our genes? Explore the various ways organisms control gene transcription through repression and induction of operons.

How An Operon Controls Transcription in a Prokaryotic Cell

9. How An Operon Controls Transcription in a Prokaryotic Cell

Is gene regulation really as simple as flipping a switch? What are the parts of an operon, and how do they function to control gene transcription? We'll study the lac operon to answer these questions.

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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